Upgrading the house from DSL to Fiber

[O2HeN2]

...actually a friend of mine, and though I'm a software nerd, ISP technology changes so fast I can't keep up and I'm hoping that someone here might be able to give me a hand.

About a year ago I helped my friend get his home squared away with an upgraded router/Wi-Fi and some hardwired connections to his big streaming devices and computer room. He's not a geek or gamer - simple streaming is about the most taxing stuff he throws at his network.

I setup his comcast router in bypass (passthrough?) mode so his router is doing the heavy lifting - the comcast router is completely out of the picture (routing and Wi-Fi disabled) except for being a modem.

He's getting Stratus IQ fiber in his house soon and I'd like to keep his existing setup if at all possible - basically a fiber modem feeding his existing router and Wi-Fi. Is this possible?

Stratus IQ isn't very helpful, stating:

"Gigabit Internet services (>100Mbps) will require a Gigabit capable router. It is recommended that customers purchase a new Gigabit capable router of their choice or consider the additional Stratus-phere smart WiFi service."

Is there a gigabit capable MODEM out there? Or a cheap router that can be put into bypass mode?

Will something as simple as a TP-Link MC220L work (with the correct SFP, and if so, a multi or single mode SFP?)

Any help would be appreciated!

O2

Ps. Upon further research it appears that no, the MC220L won't work. So the question remains, is there a Fiber modem that I can use?