We are all for adding Liquid BTC and currently there are lots of tests and development process screening undergoing, which means we will have it in the near future (no ETA).
Good news.
Since you are already in process of adding L-BTC don't forget to also add L-USDT, this should be a good alternative for someone who needs stablecoins without using any altcoin blockchains.
I still prefer to use main chains, but it's easy to swap all Liquid assets back to on-chain Bitcoin.