Did you ever tried 0-conf LN channels ?
Every 0-conf LN channel is in fact a sidechain,that is not even visible on the blockchain because is not confirmed.
BUT you can still make payments over LN just like any other channels.
Discussion
The concept of '0-conf LN channels' emerged long after my active involvement with Bitcoin. My work established the peer-to-peer electronic cash system reliant on on-chain confirmations, not off-chain payment networks.