I'm just waiting on feedback from DaveF after linking him to the new Linux binary.
The peer swarm with the new Network ID has been running great without any interruptions from other coin networks' clients trying to connect and interfere.
If your wallet uses the pchMessageStart from the repository I linked to then it should be able to join the peer swarm too and obtain consensus and validate all of the same blocks.
In the new version of the litecoin core I'm using (16.3), pchMessageStart is only part of initial testing and doesn't appear in the normal non-testing part of the code.