I'm with Franc. A tasteful, well-inlaid and executed plaque would look less cheesy than stock etching. It would be substantially more durable, too. If you look through any book on Winchester engraving you'll note the vast majority of bequest/honoraria scripts will be found engraved on receivers or inlaid plaques.

My second choice would be Chuck's idea to do a metal buttplate. The plastic Browning repro plate has a silly, slippery curve. So you could avail yourself of an opportunity to make it more functional, killing two birds with one stone.

Sam