Hi Rene,
This makes me think of @ZmnSCPxj 's Forwardable Peerswaps proposal. Essentially a way to voluntarily optimize on-chain swaps, “forwarding” them from net senders of liquidity to net receivers and replenishing liquidity across the whole route.
This would take what would be a local peerswap rebalancing one channel and have it rebalance many channels at once, with each participating node benefiting. Should at least be considered in this discussion imo.