Just my 2 cents:
1) Pretec made PocketPresenter card and I've found a way to use it on Cxxx Cacko. Then Maslovsky built the required module inside OS tarball. With pdaX and with Cxx00 - no luck.
2) IOData card had drivers for C3000, so with Sharp/Cacko it should work with Cxx00 also.
3) USB-VGA module did work, don't remember the link, though (one guy from Japan did it).
Problem is really urgent, so, if anyone is going to work on it, PM me and I'll be ready to help.