I apologize that I'm not able to make a bolt checker recommendation as requested by the OP. My only suggestion is that looking at the profiles of the members of the
American Custom Gunmakers Guild might yield some good options to consider.
Having said that, since this post is about checkering bolts I just thought I would share a rifle that I did not win at auction that was built by Dietrich Apel (owner of New England Custom Gun & now deceased). I really liked this LH Dakota 76 in 7mm-08 but I think it's the only rifle I was willing to potentially pay a lot of money for just because I loved the bolt handle so much. Unfortunately someone else loved it more than me.