Slightly seasoned amateur
Join Date: May 2011
Location: Raleigh, NC
A glue block of waste wood -- even glued up plywood -- will let you use a faceplate and still leave room to develop a foot.
Start between centers and get the bottom good and flat. Use thick CA glue to attach a small block to the bottom and press in place with the tailstock. When it sets up, you can screw your faceplate into the glue block. Make it thick enough -- or use screws shallow enough -- to keep you out of the bowl wood.
I do this all the time for platters where I don't have the wood to waste on a serious foot.
You still want a jam chuck to finish the foot, as was just suggested.