Probably better posted in the general Kaiser forum...vs the Upgrading forum; however....
I believe that Morphgear works....I have only tried Gameboy (regular) and NES games, but they both work. It does have support for both SNES and GBA.
But as you mentioned, it was created quite some time ago and thus is not optimal for the Kaiser. As I recall, SNES should be "ok" in terms of speed. GBA will be slow.
Nokia Lumia 920 (on AT&T)