coffeebaron: You can also get a basic Microtik switch to handle the VLAN tagging. I've done that on a couple of fibre connections.
I'm good up to a point.
What would this config look like in network terms from the fibre port on the wall to the router:
Guessing -> Ethernet to the Microtik switch (which is acting like a sort of modem and establishing the connection?) and then ethernet connect the Microtik to the D-Link Router's WAN port?