I just made a new riser for my passenger backrest to lift it up some for the wife to feel more comfortable.

There is absolutely no reason you couldnt make one that pushed the rest forward to fit her better.

I used a piece of .25 steel i had laying around. Got the width right and drilled the holes. I used my press brake to make the 90* bend. It could easily been less angle to bring the rest forward or put an additional bend up higher to do the same thing.