Would partial frets (not impeding or intersecting with the marquetry) align under the strings well enough to work? Fret 18 looks to be the only trouble spot. 17 and 19 have plenty room. The bass side never gets played on those high frets.
I started finishing this guitar, but to my eye it needed a little something extra to tie in the bridge and headplate and continue the black/white theme, so I added these diamond inlays. It looks "complete" to me now.