Correct on the last part re the aezeed. Because it has the start date of the wallet encoded into it, it will not return a valid BTC on-chain wallet. So either you would just reseed an LND wallet with the aezeed backup, which would then presumably let you ask any peers in channels.backup to force close. Then you can retrieve the funds from doing an on chain transaction through ln-cli (lnd-cli?).
In a case where you know all the funds have arrived back on-chain (i.e., all channels have closed and funds confirmed on-chain) and you want to access it using a standard BTC mnemonic (note: bluewallet accepts aezeed words), I believe you can use Iancoleman.io to get the on-chain key from the aezeed. (Remember to follow the security cautions!)
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Yeah. It took me a while to realize aezeed seeds are not really the same thing at all. Is it even possible to use offline seed tool? I've never heard anyone achieve that.
Sending funds out does seem safer. I'd feel very awkward about using a seed tool like iancoleman to restore any funds.
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Yeah if you load the Ian Coleman site and then turn off your internet you can use it offline although I'd likely still throw away the wallet after sweeping it. I've seen it referenced around as a useful tool.
Otherwise, it's a cool tool for learning.
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