I couldn’t find an answer while searching, but I’ll keep it simple.
Our Toyota is registered solely under my partner’s name at her old address.
We both live at the same new address with many documents as proof.
Could there be issues when trying to use the Toyota for the conquest rebate with Cadillac or Chevy?
We plan on having the lease in my name since I have the better credit.
Our state (FL) could take months for a new physical registration from the DMV.
Ugh, Address is required. You never moved it? How do you pay for renewals?
Not sure if they provide it in Fl but lots of states will give you some sort of proof for the address change right away that should be enough
Or have her cosign
No idea. This is news to me as well.
If we put the lease in her name, and I co-sign with my credit, would that be a work around?
Will depend how bad her credit is. I did that and it worked
Hers isn’t bad, its “good.” While I have tier 1.
If your car insurance has been updated to the new address, you can use that as proof.
Could I print an old electric bill with my name on that old address? 
I have no idea, the basic is proof of registration. Not sure if they take anything else.
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