They have birch down my way. 5/4.
I been e experimenting sealing maple w/spar turps mix. Heating plugs and dunking. Timing soak and weighing for penetration. 30min approx 7-10 gr increase. Ok for my build. With that penetration I would think that should curb cracking providing you dont scar finished plug in assembly. I threw 3 sealed maple bodies in water tank for 24 hrs. No cracks. I dont know if this a a viable test but thats what im going by. I would do less if i didnt want a large weight increase. These are 7" needles.
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