How do I add multiple phone numbers at once to a contact? Is there any software able to do this, which I can import to iCloud?

Question

I have my email forwarded to my cell phone via message to [[email protected]].
I do this for the reason that having my emails fetched constantly is a heavy burden on the battery.
This works perfectly, except for the fact that the emails come from a different number every time.
The numbers change by 3 digits from 001-999. (1-210-100-###)
I can write these numbers easily using something like excel to write the consecutive numbers, and not have to write one by one, but I would like to import these easily to my contact under "Email" for several reasons.
1. SMS tone to be consistant
2. Easy identification
3. Easy deletion
4. Message grouping
There are probably more benefits, however I cannot think of any at this very moment.
I want to basically write them all in to the contact to make the identity seamless.
I've tried to do so with
-Gmail - one number entry at a time
-Editing the .abbu file using text editor - Cannot find the phone number location to copy and emulate
POSSIBLE SOLUTION
Editing the contact using excel - I downloaded "Addressbook2CSV Exporter" and managed to get the contact information in an editable form.
I got the contact info which looks like
[,Other","","","1210100001 ::: 1210100002","","","","","","","","Generic","","","","","","","","","","",]
MEANING, if I can manage to merge the 999 numbers into one line of text, and add them to the numbers separated by "{space}:::{space}"
then I have my solution right there. This may have turned from an iCloud question to an excel question.
Any suggestions will be greatly appreciated.

Answer 1

Fair enough.
I started doing this before unlimited data and emails on phones was a common commodity, on my Samsung Blackjack.
I then continued it due to its convenience. My only counter argument is this:
Even when emails are set to immediately push, I am always notified earlier by this forwarding message (sometimes by several minutes/hours due to the fact that it is not dependent on my being connected to 4G or wifi to receive it.
Also, to contradict snozdop's point that both methods use data and battery, I say this - when I use the forwarding method, the information comes in a pure text format and therefore uses considerably less information than an HTML and CSS rich email, with embedded images and such -also, unlimited text messages aids curve costs.
I will, however, give this method a go. In any case, a solution to my original question would still be greatly appreciated.
Thanks guys.