A few ideas for your next (or next next) IndivisionAGA
To fix the 'wobble' you could use those silly HD cradle holes which are just waiting to have something stuck into them.
Have you seen the graphics filters used by Mame/Scummvm/DosBox/WinUAE to enhance old VGA screens up to more modern displays standards?
Why not take the Amiga's native signal (eg 320x200 8bit) and the perform some realtime post-processing to bump it up to say 1024x768 32bit with a higher refresh. The good thing about this approach is that the Amiga would remain 100% compatible but everything would look much better