Strangely enough, two people have asked me already about a desktop lightning wallet that is non-custodial, but is not a full node requiring bitcoind or something complicated (it can have full node like Breez, if the node is invisible to the user and doing something like Neutrino). Something like Phoenix or Breez, but for desktop.

Any ideas?

I checked: Breez, Phoenix, Zeus don't have desktop versions, Green does have desktop version, but it's based on prehistoric Green version that doesn't do lightning.