You see the crap I have to put up with being me? My brain has not turned off for several weeks now, and constantly produces things like this...
Don't want frets, just markers, so how about this? Birch 2.5 inch hobby board from home depot. Lay out locations as accurately as possible, and mark very fine, like with xacto blade. Metal guide fence, and burn with a soldering iron, deepening the slot a bit. Now, mix some acrylic paint to your favorite color and paint the slots. A bit of paint on the fretboard is okay, because when dry, you lightly sand the fretboard, leaving a bare birch board with colored lines...and a dark outline around the color.
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Or...................
Why not just buy a silver metallic Sharpie and mark the fret locations and be done with it
Upgrade?
Nice git. Decades ago I worked in the Rickenbacker wood shop. Reminds me of one of the models...