It's not as simple as opening a channel to a new node. Phoenix is tightly integrated with the ACINQ LSP which handles liquidity management, splicing, pathfinding, and probably a bunch more stuff I am not even aware of.
Even with all of that functionality the biggest thing you lose out on by forking Phoenix is the accumulated technical expertise at ACINQ.
Try Breez, Mutiny, Zues. Or run your own node. All vastly easier than trying to fork Phoenix and make it work.