Multiple instances of Mail.app must be possible

I've seen many questions regarding the possibility of running multiple instances of Mail.app as separate processes. There seems to be much good reason to be able to do so, i.e. separating work and private mail, and very little bad reason to do so (maybe some problems when doing upgrades or backups, but I'm not yet sure of this). It also seems that it should not be so hard to do.
So far, using some web acquired wisdom, I've done the following:
1. Duplicate mail.app:
sudo ditto Mail.app WorkMail.app
2. Rename the executable:
mv /Applications/WorkMail.app/Contents/MacOS/Mail /Applications/WorkMail.app/Contents/MacOS/WorkMail
3. Use Property List Editor to set the following values in/Applications/WorkMail.app/Contents/Info.plist (Apple-S to Save changes!):
Root/CFBundleExecutable=WorkMail
Root/CFBundleIdentifier=com.apple.workmail
Root/CFBundleName=WorkMail
Root/NSServices/0/NSPortName=WorkMail
Root/NSServices/1/NSPortName=WorkMail
Root/NSServices/2/NSPortName=WorkMail
Root/UTExportedTypeDeclarations/0/UTTypeIdentifier=com.apple.workmail.emlx
Root/UTExportedTypeDeclarations/1/UTTypeIdentifier=com.apple.workmail.emlx.part
4. Create the following directories:
mkdir ~/Library/WorkMail Downloads
mkdir ~/Library/WorkMail
4. Launch the 'new' application 'WorkMail'.
5. Create mail accounts using the application's 'wizard'.
Here is where the first problem is encountered. The new account directories and files are still created at ~/Library/Mail. Navigating to Mail->Preferences->Accounts->[account_name]->Advanced seems to offer the option to change the mail store account directory, but nothing can actually be changed here. So...
6. Quit WorkMail.
7. Move newly created account(s) directories (where [newaccountdirectory] is a directory named with the format: [mail_type]-[user]@[domain].[tld]@[pop].[domain].[tld]]) to the correct location:
sudo mv ~/Library/Mail/[newaccountdirectory] ~/Library/WorkMail/
8. Use Property List Editor to set the following values in ~/Library/Preferences/com.apple.workmail.plist (Apple-S to Save changes!):
/Root/ActiveViewers/0/AttachedMailboxListExpandedItems/[0to_#_ofaccounts]/=~/Library/WorkMail/Mailboxes/...
/Root/CurrentTransferMailboxPath=~/Library/WorkMail/Mailboxes/...
/Root/MailAccounts/[0to_#_of_accounts]/AccountPath=~/Library/WorkMail/[new_accountdirectory]
/Root/MailDownloadsPath=~/Library/WorkMail Downloads
9. Relaunch WorkMail.
Everything at this point seems to work okay, **BUT** when I launch Mail while WorkMail is launched, I find that I cannot navigate into any mail folders within Mail. I receive an error message indicating that a necessary directory is locked. It seems that the locking mechanism used by the application may be hard-coded to lock ~/Library/Mail, and both instances of the application continue to take this action when launched, making it impossible for both to work harmoniously at the same time. I will conduct more testing and experimentation, but I am not yet capable of editing the application itself. If anyone can take us this last step, I'm sure there are many who would also like to be able to take advantage of the potential functionality.
Thanks for any input!
Steven Stromer

Hopefully, there is someone with a programming background who
can take me and other who have posted similar questions through
the final mile on this...
Well, I do have a programming background, and I must say that it amazes me that someone might want to do what you did to “solve” a problem that IMO doesn’t exist.
What exactly is it that you expect to accomplish by running multiple instances of Mail, and for which neither (1) organizing your mail using multiple mail accounts, custom mailboxes, rules, and/or smart mailboxes, nor (2) setting up separate user accounts, are acceptable solutions? I just don’t get it.
I've seen many questions regarding the possibility of running multiple
instances of Mail.app as separate processes.
I haven’t. Could you please provide a link for such a question, preferably one asked by someone who knew how Mail and Mac OS X work, i.e. a link for a case where there really was such a need?
There seems to be much good reason to be able to do so
I know of no such reasons, neither good nor bad.
i.e. separating work and private mail
I don’t see how that’s a reason to want to run multiple instances of Mail. Could you please elaborate?
Maybe if you tell us what exactly is the problem that you’re trying to solve, instead of focusing on a convoluted “solution” that doesn’t work, we could propose a solution that does...
and very little bad reason to do so
Well, if the fact that it’s so convoluted and doesn’t even work aren’t bad enough reasons, I don’t know what it is...
It also seems that it should not be so hard to do.
I wonder what makes you think so. It does certainly seem hard to me, so hard that I don’t even think it can be done without breaking something, if at all...

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