Doc:
Is it the grooves or the width of the trigger that is giving you fits?
If you are hady with a Dremel Tool, you can hone down and polish the trigger face entirely, or just smooth the ridges until they no longer bother. This can also be done with silicon carbide paper in a fine grit, although it takes a while.
If the width is a problem, smoothing the grooves and then rounding the outer edges can allieviate much of this. Care must be taken to keep grit and metal dust out of the action (Tape, and wrapping with an old T-Shirt, perhaps) but if you are handy with this, it is cheaper than the alternatives and might suit you better than you think.