Probably should ask Warmoth. But, I'd wager they'll say no unless you have the whole thing hard finished. Although, I wonder if now that they have roasted Maple in stock that they might do some fretboards alone with it, which would remove the need for the finish so you could attach it to a neck meat wood species that doesn't require a finish. That might be the question to ask. That would be sweet. Maple over Pau Ferro. Maple over Bloodwood. Maple over Wenge. On and on. Lotta combinations that have previously been unheard of. What would be wrong with that?