I don't think my setup is fully NIP57 compliant yet (waiting on BTCPay) but...
Sending client doesn't have to do anything for support AFAIK, so should work fine for sending :)
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Yeah the NIP is for the receipt part to allow for live amount updates etc, right?
AFAIUI, yes, the Nostr portion is done by the recipient's node/software, sender just has to support LN addresses of course.