FM Turbo w/ QMax Coolant Reroute?
 

The FM turbo kit has an option to select if you have the FM reroute kit or not. Will this work with the Qmax coolant reroute kit (already installed by precious owner) or does it only work with FM's reroute kit?

That option is specifically for the FM reroute, the Qmax reroute does not have the same design as FM. I don't know if it could be made to work, but it will not be plug and play.

The FM kit routes coolant to the re-route kit location just downstream of the thermostat housing. No other kit does that. They argue this keeps the hot turbo coolant stream out of the engine block until the rad has cooled it down, which is a sensible argument.
The FM turbo set up will work with most reroute kits, but their option for "if you have their reroute" specifies the length of hoses and fittings you need to source coolant from where they source it, and dump it where they dump it.

Other approaches dump the hot coolant into the small coolant line between the intake throttle body and the "mixing" point entry to the water pump, and take it from the thermostat housing, if there is a connector available on it. The Qmax the the needed connection port and just needs a hose barb screwed in.
You may need to obtain your own coolant hoses (pretty standard hosing), but I think if you do not select the FM kit option they still supply a line, you cut to your needed lengths.

I have an FM turbo and SuperMiata QMax reroute kit, and had no trouble. Yours should create no trouble either. You just might have to source a fluid T to tie into the hoses in appropriate places.

Great info, thank you!