I've used hcitool and other Linux BT utilities; however, I can't think of any that would accomplish what you want to do. Given enough effort, I'm sure it's possible. The question is how much effort.

On the other hand, mebbe you can cob some Palm freeware to do what you want:

BT Serial
Triconnect
Bluefang
Wireless Networking over BT

Check the requirements. I think one of the above may be for OS4, but it might work for OS5. As you can see, I found most of these at frewarepalm.com. The normal Palm software sites (palmgear.com, handango.com) didn't seem to have anything useful.

And yes, I think all the former Palm users have things we really want to see provided by GVM.