I had some aluminum diamond plate, so I used it to make an insert for my Powermatic. It works great (diamond side down).
I roughed the shape in, then finished it on the drum-disk sander. To adjust for fit, I just go out near the edge with a center punch and flare the edge until I got a good press fit. If it loosens a year or two down the road, I just repeat.
I could do the same thing with Plexi or one of its relatives, sans the punch, of course. A little hot glue, UV glue or even epoxy would work to adjust height.
I make several.
Now I have a 3-D printer ($150.00) and my and my friend's saws all have back ups.