The work part is not too much to undertake, but the tools needed can be rather expensive. At one time I had a set of radius blocks which ran me over $150 for the entire set not including the leveling bar which was another $40. I think they have come down in price now though.
Covering the fingerboard with veneer would have required a custom radiused clamp to insure complete adhesion. Another problem would be that the veneer is probably new growth and not near as dense as the well aged old growth wood used by Matsumoku. It is possible it would "dish" from wear and play sooner than the original wood. Mr. Hayashi was somewhat of a stickler for quality, properly cured woods.
I have a CSB and the rosewood fingerboard is really nice, solid wood.
Matsumoku's commitment to quality materials and workmanship really shows in that drop dead gorgeous FS of yours.
That thing is an absolute knockout. It's hard or maybe even impossible to find production guitars today with wood as nice as that.