Dont know if the MESS emulator is any more stable....never tried it.

Sheepshaver is not available for MorphOS as far as I am aware. But I could be wrong.

Picking up early PowerPC or low end macs are pretty cheap if you search about.

Also with the likes of Macintosh Garden, you can get quite a lot of old software to play with.

[ Edited by zerohour 16.07.2015 - 21:40 ]