A gunsmith should be able to sand, drill and tap holes in the frame to let you install "real" removable grips. Thats what I'd do. I hear ya on the rugers being hard to find. Took me awhile to track down a new MK III recently.
Here's a step by step that will allow you to use 1911 grips if you wanna tackle it yourself: http://www.ar15.com/content/page.html?id=347
Last edited by steveNChunter; March 14, 2013 at 07:12 PM.