Those floorboards are going to be a chore to make very shiny. It will be difficult to get an even glossy finish around the lettering that is cast into floorboards (YAMAHA).
I would suggest that you paint them some acceptable color and call it good. You can prep the surface with a bead or sand blaster. From experience, you are better off using a chemical to remove the clear coat, don't try to blast it off. It's tenacious. I prefer aircraft paint remover, red can, Auto Zone has it. Stuff is strong, so be careful with it.
You will need to remove rubbers from it either way. Getting out is fairly easy. Getting back in is a tad harder. I ended up tying a fishing line around the rubber protrusions, feeding line through hole, lubricating rubber and then work it through each hole. It can't be just pushed back through hole, has to be pulled. I recall someone else a couple of years ago posting a different technique to do this, but don't recall what they had done.
Picture shows Tweety's floorboards for an idea what painted ones would look like. These are powder coated and have held up well.
Gary