Since you are using the cnc to remove the excess and it works you can try sealing with dewaxed shellac (Universal Sanding Sealer Zinnser) on the project first followed by a couple coats of wipe on poly. The shellac and poly keep the epoxy from seeping into the wood and when you sand it all comes off back down to raw wood. Also surfacing with the cnc does the same as sanding. I have made a lot of epoxy filled inlay with the shellac and poly method. I use poly because it is water proof and can easily sanded off and reapplied. I use Transtint liquid dye for coloring the epoxy. The transtint is alcohol based and will work with any water or oil top coat. If the epoxy does not look shinny after sanding the poly top coat will being back the shine.
I apologize, I didn’t see that you asked a question! I used alumilite clear resin, once mixed I used a drop of white opaque dye and then some green alumilite dye. I overfilled the vcarved designs then just used a benchtop belt sander to smooth them out.