I bought a Westfield bass via eBay for less than £30, with the express intention of removing the frets.
I’ve always been happy using hand tools, I just used a small bradawl as a ‘drift’ to tap the end of each fret, then carefully eased them out of their slots. If I was to do it again, I would definitely heat the frets to soften the glue, as I did have one wood flake.
Not being confident enough in my playing, I didn’t try to remove all traces of the fret lines, but filled them with plastic wood, and sanding down carefully. I didn’t worry about the marker dots on the face, as the bass also had side markers.
To finish it off, I masked it up well, and sprayed the face with primer and then two coats of satin black from a rattle can.
Sorry I don’t have a better pic - I didn’t really get on with having no frets, so I sold it, again on eBay, for more than twice what I’d paid.......