Big Al, you seem to be asking for the impossible. You cannot walk around and play guitar at the same time unless the guitar has a strap.

But i know what to do. When you set up the gigs, specify an armless office chair for you to sit in. Then when you have to move, scoot rather than walk. Make sure it is a safe, modern chair, not some old junker that tips you backward.

That's the only thing I can think of.