Picture in my head
OK - picture this with me.
Take one of those lap pillow things - connect to it a triangular tent (a metal rectangle bent in the middle say, 30 degrees) with a hole in it for the power chord and a "bumper" about 2 inches in front of the tent to keep the iMac from slipping down.
Someone with some capital - go do it! Maybe LTA could sell it alongside their iLugger bags (designed to make the iMacG5 more portable.)
I drew a pic, but I can't figure out how to post it here. 😉
That said, not doing it with my new iMac G5. Yup - it's going to travel with me quite a bit (to work for the week and back home on weekends), but it'll be going securely from table to table.
As fer taking the foot off - there are special VESA tools, I guess, for doing it. Not sure where to get them without buying an actual new mount.
Good luck!