Migrate or link all apps to different Gmail account

When I first got my Android phone eons ago, I used a Google Apps account from my university to sync email, use with the market, etc. I'm finishing my Masters in December and they cut off email access after graduation unless I pay for and join the alumni association, which I have no desire to do.

All my services are from this point forward tied to my private Gmail account, but I do have a problem as all my market apps are associated with this Google Apps account that will be shut off. I have no paid apps so it's not as if I have a huge amount of paid content that I'm losing, but it's a huge inconvenience to me because I can't update the 50 some apps that aren't tied to the Market anymore.

I'm on a rooted Evo, is there any tricky method using Titanium Backup or some other alternative to link all my current applications to the Gmail account? One thought I had was to make a full backup of my ROM, flash a different ROM and re-download all the applications I want but under my Gmail account, then flash back to my current ROM and restore with Titanium Backup so I don't lose preferences, data, etc.

I'm open to any ideas.

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