I had a a friend that said an old timer made bows like that,, buried in the dirt to cure,,thats all I know,,it might reduce checking by slowing the drying process,,maybe you could strip the bark,, and skip coating,, if you bury it,,,, when I had staves in Texas,, the bugs were pretty bad,, so if it helped that,, I can see doing it,,
in a time without a steel draw knife or store bought varthane to coat the back,,,, these techniquues probably were of great value,, now they are interesting but I doubt any advantage over more modern techniques to cure the wood,,but fun to try,, I always enjoy seeing how an ancient man would have to resolve issues like this,,