Audi 2005 Car Interface - How to Downgrade Touch to 2.2.1

I have a newly installed car interface in an old (2005) Audi. This box is the only one compatible with my Audi Symphony sound system - the ones in new cars are problem free, I understand, but buying a new car for my iTouch seems like a radical solution...
Anyway, my Touch 2G iOS 3.0 plays back fine, but doesn't charge. Turning the radio off doesn't turn off the iTouch, so, if I forget to manually shut down (which I do every day) the battery is dead after work.
I recently borrowed an iTouch 2G iOS 2.2.1, identical to mine in every way except for the older version of iOS. Low and behold, the radio "on-off" controls the iTouch under 2.2.1!
I don't have apps, I don't use the iTouch for anything except my long commute. Downgrading to 2.2.1 would be a perfect solution for me.
Does anyone know how to do this?

My guess is that Apple doesn't offer the 7.1 installer online b/c they want to promote users to move up to Tiger. That's reasonable from a marketing and software development perspective, but for ProTools users, that's not yet a viable option. I thought I could get the 7.1 installer from the Apple site, but it's only the updater & it requires a previous install of 7.1.
Also, I'm making an assumption that my 7.2 authorization will allow me to run 7.1, but I don't know if that's really the case.
It should be easier to upgrade from Platinum to any later version - i.e. one that actually works in my situation.
Thanks for your comments.

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