Update on the lost ledger nano story:

[...]

If i can't find it there, it's lost for sure. If somebody finds it, that somebody has three attempts to guess the pin code, then it will auto-reset on failure.

Seems safe to restore the wallet(s) to the spare ledger i happen to own.
But i failed to decide if i would create a new key and transfer my Bitcoin from a recovered software-wallet. I am not sure which way is the safer one.

Any suggestions?

EDIT: There is a small chance that the device's key store can be read out through some bug or quantum magic (maybe, i don't count on it), IF even somebody had found the ledger and any clue how to use it. Smallish, very smallish chance, though. This would make the restore method on a new device less secure, of course.
But less secure than re-creating the wallet in Electrum and transfering the coins via protocol to the newly setup ledger wallet...