You want to use the H320's USB Host capability to communicate with the Zaurus USB Mass Storage mode (backported from the SL-C860). I don't see why it wouldn't work, but no, I haven't tried it myself.
I don't have a H320 but I may have access to one, I'll let you know if I can try it out.
I´ll go for 2 month to scotland and want to take some videos with me :-)
We have videos in Scotland too!!!