Alright, don't laugh at me guys!
I am running a noctua NH-L9i on a delidded 8700K with thermal grizzly conductonaut between the die and IHS. I am using thermal grizzly kryonaut on top of the IHS.
The CPU is undervolted a bit and I haven't lowered the clock speed yet. Temps are fine for gaming on the CPU, but once I do anything more intensive like CPU based rendering/encoding it does get uncomfortable. I have hit the TJmax while doing this at times, but never while gaming.
I think you will actually be fine in the ghost with air cooling using something like a notcua NH-L9x65 or NH-L12. You might be able to get a decent OC provided you delid the 8700K.
I am hoping in the ghost with an AIO CLC I can OC this thing and do it some justice.