If you have your sats in Phoenix wallet (among others) you can pay directly to an on-chain address. I believe it’s a channel splice, at least when you receive to Phoenix on-chain, so it you’ll retain one unified Lightning channel but it would decrease your total capacity some.

What I’m not certain of, and where I’ve been unpleasantly surprised in the past, is how much your Lightning capacity is reduced when you send to an on-chain address.

It may be that it only reduces your capacity by approximately the amount you send out, plus some wiggle room, or it may be that it diminishes to just accommodate your current balance plus some extra space.

So if you have a 1M sat channel with a lot of inbound capacity, and you send on-chain with a small Lightning balance (say 100K sats) remaining, it’s possible that your total channel capacity drops to ~120K sats. Or it could be that it just goes to 980K, and I’m frankly not certain.

On the plus side, with fees as low as they are, it’s not that big a deal — you can just send another 900K sats to your Phoenix address and it will splice in to reopen the full capacity.

But I did this when fees were high, and ended up paying a lot. (On-chain fee to send the sats, on-chain fee to shrink the channel, on-chain fee to send more sats to Phoenix and another on-chain fee to splice in and increase my channel capacity again). Today that probably costs a couple thousand sats at most. At the time I think it was upwards of 40K in fees.

Anyway, it works 🫡