It sounds a lot like the idea I was going to apply to YC with, bugger.
If you want fast prototyping for mobile I'd recommend using python on a nokia S60. Theres pretty much a full hardware api allowing you to access the camera, phone book, etc.
True, getting stuff running on 'dumb' phones like the razr is crucial. Wonder if python could run on top of javame? I would anticipate it be very slow.
There was once upon a time a bit of rumbling about getting Jython going on javame. I don't think anything ever came of it, and if standard Jython is any indication, it would have been, as you said, /very/ slow.
You really have to start with a *small* core language, or you will end up with something on your phone that's "sort of" Python/Tcl/Ruby/whatever. Hecl isn't a speed demon on a slow phone, but it is still usable.
If you want fast prototyping for mobile I'd recommend using python on a nokia S60. Theres pretty much a full hardware api allowing you to access the camera, phone book, etc.