Why not skip the liquid peg-in and send the BTC to boltz and swap for ln? Am I missing something or is it just to have liquid in self-custody?
Discussion
The main thing is that will self custody lightning you'll be hit with on chain fees to gradually grow the size of your channel via splicing each time you receive. Letting it build on liquid then doing a large swap to lightning will only incur one on chain fee to create a fat channel to your Phoenix wallet.