You can migrate from Umbrel LND to Start9 LND with extreme ease. The migration is even now built into Start9. As for the timechain, I would guess it's doable. You'd need to move the Bitcoin data to another drive and then move it back to the new Start9 install.

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Yeah that's what I'm looking to do. I've found a little info, it doesn't look too hard.

Copy the blocks, chainstate, and index directories in place on the new install while Bitcoin core is not running, fire it up with my fingers crossed 😂 I have a few days to research as well 👍

https://mynodebtc.github.io/bitcoin/data-from-other-node.html