Why bother changing the ONT? If you can log into the Verizon router, setup DMZ on the static ip that you will use for the wan port on your router.

I'd tried doing the above methods a while ago and got nowhere with Verizon. They were a pain to deal with and they wouldn't speak to me at all, only the customer who played middle man between us.

Tried the DMZ method and has been solid since.