Best way to replace source footage

Question

I have about an hour of continuous source footage that I used to create a complex 15min edited version in Final Cut Pro X v10.0.5.  After this project was already completed, I received a better quality version of the original 1 hour of source footage.
What would be the "best Final Cut Pro X way" to replace the original source footage with the higher quality new footage, without having to redo my complex edit?
Unfortunately, my new footage is slightly different frame rate, dimensions, and quality than the original, and also not exactly in sync.
I imagine this is the type of thing that professional editors must contend with all the time, but I'm not finding an efficient way to do this in Final Cut Pro X.
I've unsuccessfully explored three options:
1.) using the (new since v10.0.3) Relink feature
This is the workflow that seems most similar to those on other editors, however in Final Cut Pro X is seems this only works if the new media file is nearly identical to the old one.  It explicitly states that it doesn't work with footage of different frame rates.  And I also didn't see any way to sync to the old footage, if the new is slightly different length.
2.) importing as a new clip and syncing in the Event Browser
I see that I can sync two different clips in the Event Browser to create a compound clip, but how does this help me easily replace my already edited footage (which was not the new compound clip) with the new?
3.) using the (new since v10.0.3) Multicam editing
I know I can import the new source footage and sync to the old using Multicam editing, but again, how does this help me replace what was already edited from a non-multicam clip?
Suggestions?
Many thanks for any tips.

Answer 1

We also had a long debate on the same issue.
We decided to try the Soft-Code values instead of the Hard Code.
1. Create some custom tables which can hold the constant values. Like: We have some special processing for the normal sales Order ZOR1 and different logic for the Returns order ZRE1.
So, we have created
One table for the Group - NORM, RETN
One table for the Sales Order & Group relation.
NORM - ZOR1
NORM - ZOR2...
RETN - ZRE1
RETN - ZRE2
Create a View Cluster to maintain these tables easily.
2. Create a Classes which can fatch this data
Like: VALID_SALES_ORDER_TYPE
Definition-
Importing :
  Sales Order type
  Group
Exporting
  Valid
Implementation-
  Get the value from the table Sales Order & group relation
This class contains some other methods also, like VALID_GROUPS_4_SO, VALID_SO_4_GROUP etc.
Advantage: You can easily maitain a new Hardcoded value in the SM30
Disadvantage: Lots of coding
Another Approch:
You can create one Global class for Constants. You can maintain all your constants in that global class and use them in your coding. One main advantage would be, you can easily do the where used list on each individual constant.
Regards,
Naimesh Patel