What would be really useful is if you could find somebody who knows how / has software to write CE apps. (I don't though, unfortunately)
There's some information here (naturaly some of the links don't work, but there is a copy of BasiCE floating about on Tucows).
If there is a MIPS version of Pocket GCC then you might be able to use that (standard C programming, lots of help available on the net)
Sorry I can't be of (more) assistance
Good luck.