If the "head of the cooler/Coldplate" fits onto GPU die and you can tighten it down, you can use aftermarket copper heatsink and use thermal glue to stick them onto the VRM's and zip tie the fan onto the GPU.
But i dont see the point of watercooling the GPU unless you're doing the full loop (As aesthetics reason), also the GPU is hard locked for overclocking, yes you may keep the Turbo always if its under 60*C.
Try to send them a message, since some say the FE version is supported, I really don't know since I've never done that.