Having said that It would be nice to have control over the ONT as well. there are PON sfp optics, that may be the easiest way to set up your own fiber capable router. I have heard it is tricky to to talk the isp into allowing your modules, you probably need to know a guy that works there.

There are also ONT/media converter boxes that'll spit out ethernet if you plug in a fiber and set the appropriate DIP switches. I found one hanging in my apartment when I moved in. I've also seen people sell them on second hand marketplaces (probably not realizing that they're technically property of the ISP). Buying newer ones that spit out more than 1gbps as a consumer can be a challenge, though.

There's a nice variety of small Linux router boxes available online that are relatively low power but still offer good connectivity through SFP(+) ports. Getting Linux running on those is easy, the challenge is in figuring out how to active the connection.