Could be an option to rebalance your LN channelsm but is useless because you still need PERMISSION to peg out the BTC from L-BTC if you want to go onchain.

For a quick drain of a LN channel into Liquid, is OK, is a method that merchants could "make space" in their inbound channels so they can receive more. The problem is when you want to move those sats into your HODL BTC onchain... So too much trouble for nothing to achieve.