Brien,
I'm a fan of using a clipboard. Though the clipboard itself is the bulkiest part of my radio kit! But it makes a convenient surface to hold in my lap, or even standing up. It also makes it easy to set down my whole station if I need to go adjust the antenna or something.
The DG1JAN antenna winder/balun () has convenient holes to hang from the hooks that remain on the bungee cord securing the radio + battery. At one point I had a key mounted with velcro, but the velcro just tore off the top layer of particle board where it was mounted. If I wanted a mechanical key again, I would mount a metal plate where it would reside and use a key that attaches with magnets. In the meantime, I love my VK3IL pressure paddles for field operations.
Someday I'd like to figure out how & where to secure the speaker.
72 de Todd W2TEF
Todd W2TEF