I've used FMC's (fiber media converters) too, still do (and own four of them ) but in a different way. You may find my system's topic interesting as I've touched many of the things you mention. It's a bit long since it's been up since 2014 and I change many things, often. Anyway it's here: https://devialetchat.com/showthread.php?tid=46
PS Audio P3, Shunyata ΞTRON Alpha Digital and HC/Furutech power cables, Paul Hynes SR7EHD-MR4, DIY Roon Server & Roon Endpoint running AudioLinux Headless, Phasure Lush^2 USB cable, Audioquest Diamond RJ/E ethernet, Uptone Audio etherREGEN, Mutec MC-3+ USB, Shunyata ΞTRON Anaconda Digital XLR AES/EBU, Devialet Expert 250 Pro CI, Nordost Tyr Reference LS cables, Von Schweikert VR-5 SE Anniversary Edition, Anti-Mode Dual Core 2.0, JL Audio Fathom F112. More detail here.
The Netherlands
The Netherlands