Personally tried using CLN with a RPi node a while ago and it was a complete disaster, i deposited on-chain funds and suddenly it stopped working i didn't even got to the point of opening channels.
So with this I tried basically everything to recover funds but there were not enough documentation or solutions, but found a tool on the CLN telegram group, that helped me recover the on-chain funds by converting the hsm_secret.bak to an xprv to move out funds.
If you happen to have them stuck it can probably help you in some way to recover UTXOs