Hi Ethan,
I've been investigating Solution Manager Retrofit as a possible tool to help, but I don't think it will work in this scenario. Can anyone help provide some high level guidance?
You can manually track the changes which are being imported into Production system of Maintenance Landscape. Perform manual imports into Project landscape development system.
Perform upgrade impact analysis + unit testing on Development system of Project Landscape.
Perform SIT on QAS system of Project landscape
Alternate solution.
If you have CHARM implemented into your landscape , you can use critical object identification using solman. This will automatically highlight which objects needs attention.
Hope this helps.
Regards,
Deepak Kori