Amusing oddity, while I want to replace RetinaEmu 2.3 with something more 'modern' it seems capable of displaying Deluxe Paint screens very well. I can only guess how well it handles AGA stuff (it does allow for 256 color workbenchs)...
PS: One fault is that fills and shapes won't get colored in right away, you have to drag your cursor around blinking over them (I think it doesn't refresh the screen) but afterwards it works... it's sitting upstairs right now displaying a HAM image from one of the art disks.