Fill the cracks with super glue seal the whole bow. Weight for it to season forget the cracks if theres no run offs and go ahead a make the bow.
I once trade for 4 osage staves with drying checks 2 was really bad. One of those I took down a couple rings it was ok. But the other 2 the checks were there after I went down rings. 1 Had bad run offs it lifted splinters I made bows out of the 3 others. Just forgot about the checks. I've made other bows with a check or two. Never gave them no mine either.