Great thread !!

I did this recently on one of my guitars....
But I used 12" radius block to maintain the FB radius and it worked like a charm. I started w/ 220 then went 350, 500, 600.....Overkill probably but sandpaper is cheap : ) I don't have the crowning tool, so I make shifted a foam block w/ a handle (thinking it would follow the fret profile) lots of elbow grease but it turned out pretty good. Then polished them up w/ 0000 steel wool

See:
http://www.stewmac.com/shop/Fretting...ng_Blocks.html

Teadius work indeed, but well worth the time...