We had something kinda sorta similar under our kitchen sink in our island. Had to slide whole island over after incompetent contractor couldn't center it in the room.

It was a pretty painstaking process, but I bought a piece of 1/8" thick white plastic from McMaster Carr (to match melamine inside cabs), probably 12" x 12". I made cutouts for each pipe, then cut it in half so that it would clamshell around the pipes. Glued it down and that's how it's been ever since.

You could do something similar with any of a number of materials (plastic, wood, metal).

Plastic, plywood, whatever you have handy.

Measure pipe diameter, cut hole in materiel, cut in half through center of hole, fasten in place.

I have even used tile held in place by weight alone.

Go to an HVAC supply house and they have oversized chrome trim escutcheons that are used when converting a live steam to hydronic system.

Thank you all for your great suggestions, I appreciate it! I also am considering getting a shower escutcheon because the one we have would just about do the trick. We are thinking to take it to a metal place, have them cut it in half, and then rejoin and glue around the pipe...

"I also am considering getting a shower escutcheon because the one we have would just about do the trick."

Not a very large pipe then.

Most real hardware stores should have split escutcheons for smaller size lines.