If you're going to the trouble of pulling a motor to ship for repair, I'd probably just ship it with heads and all and get a fully rebuilt one from Carbahn/Steve Dinan for $14,999. This is actually a great price, especially for what you receive as junkyards price
used ones in the $9-11k range.
https://carbahnautoworks.com/product/s65-4-2l-rebuild/
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Current Stable:
2024 G20 M340i Melbourne Red/Cognac
2019 F87 M2 Competition 6MT, LBB, slicktop, exec pkg
2021 X4 M40i Phytonic Blue/Black