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
This requires participation of an LSP, did you get any to try it out?
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Still in the idea stage
