Hi Jaba-
If your Pocketop keyboard is the IR version, someone wrote a
GPL driver for the iPaq that is supposed to be functional with a few bugs. It could work on your Axim, but the author provides no guarantee.
I did find a version of the driver for the X50 at
Aximsite available for
download, but cannot verify the validity of the file myself as I don't own a Pocketop keyboard.
It's a bad move by Pocketop to demand payment for drivers for new devices.