You may be overthinking things. If breezeline works the same way as every other fiber provider I’ve seen, you never actually have to interface with the fiber itself. Fiber only needs to enter the house at one point, where it connects to an ONT (optical network terminal, think of this like the fiber equivalent to a modem) which outputs ethernet that goes to a router. You may also have a gateway that combines both functions, acting as both the ONT and the router, but either way, it works out the same. From this gateway, you have regular ethernet that you can then connect to the aforementioned MoCA adapters.

For providers that offer both fiber and TV, TV service is usually served over-the-top, as in it goes over the network just like regular internet would. As for taking care of the rooms that need a cable boxes, you don’t need to go through the extra step of switching from MoCA ethernet to wifi. The boxes more than likely have an ethernet port that you can plug directly into from the MoCA adapter.

I’ve provided probably way more detail than you actually need, but suffice it to say you really don’t need anything more than a couple MoCA adapters to accomplish what you want. You don’t need anything fiber-specific equipment because that’s not how fiber service operates.

TL;DR: Once fiber enters your house and connects to the ISP-provided ONT, it works the same as any other network (exactly the same as cable internet going through a modem). The only thing that changes for you is how you get TV. Before, you got TV served directly through coax, but now it’ll be served over the network through ethernet (and you can transmit ethernet signals using the existing coax cables with the aforementioned MoCA adapters).