If you like you may become a beta tester
I have not been able to test the emulator on a different device. Your iPAQ is even a bit faster (640MHz)
Files can be shared over HostFS. This is even possible while the Pocket PC is syncing with another PC. If you have wifi networking or bluetooth you can even upload files wirelessly into the hostfs directory.
There is not yet networking support on the emulator so sharing directly with RiscOS is not available.