I know you said no emulators, but it seems like no one had thought about suggesting or making one. What i'm trying to say is if some how we can get an emulator it would run very smoothly because the games are made for low processing phone like mine its a joke (it slows the processor when playing mp3 files but can run 3d mobile jar games smoothly). I just hope some would have a look into this!
Sounds promising but at looking at the webpage, you wouldn't be able to run newer .jars that require the newest version of java and would need some updating or a new windows CE program coded to use the latest java with windows CE. suggesting that it is possible to run the latest version of java on windows CE to begin with.
Hope it works (its for liberate win ce)