John, you could also just make it our of 1X8 tpi bolt so your chuck and faceplates fit it and then make a mount somehow to use in a bench vise. My tool rest has a 1" post, but I plan on making something to use in a vise as well so I could have a piece on the lathe and also on the carving stand.
The pics below are a few I found on the web and show a few other ideas...I like the one with the bowling ball clamped between PVC cutoffs as you can swivel it around anywhere you need it.