I just posted Payjoin-in-Potentiam to fund LSPs to open channels on your behalf in one atomic transaction. This is an optimization of Swap-in-Potentiam that posts only half of the bytes to the blockchain to achieve the same outcome.

Check it out on Delving Bitcoin:

https://delvingbitcoin.org/t/payjoin-in-potentiam-externally-fund-an-lsp-channel-open-with-one-transaction/749