Kryonaut is not the best solution as it pumps out easily above 80C and you end up with worse temps after time.
For me the best solution is Phobya Nanogrease Extreme
…and as far as I know, the Full HD panel on KM-G is either 144Hz or 240Hz or 300Hz…
so there is little chance the G-Sync will work unless your 144Hz is exactly the same model as the one on default for KM-G