If you were thinking of Cammy and Rebel_CD32, they are already quite busy. Cammy is learning to program in AmigaE and Rebel has a lot of pixel-art projects to work on. They have the collective name of Underground Arcade.
At one point I thought about porting it to the A1200, but there were issues.
- The pixel per row alignment of the background is to the nearest 32-bits rather than the nearest 16 bytes like the AGA chipset requires.
- Most of the music for the engine is in Ogg Vorbis format which would chew up and spit out an '030 for lack of processor power for decoding.
In short, it would be easier to make a new engine that used AGA-compatible programming techniques and then export the files for the new engine to make them compatible with OpenBOR than it would be to go the other direction with it.