Conrad Mas recommended that the Avid Acutus, another suspended table, should only be used with fixed bearing arms like the iV/V. The only unipivot to be the exception was the Graham because it is as stable as a gimballed arm. I’ve seen a few Acutus’s combined with the Phantom and they (reportedly) work well together. The SME15 suspension is nowhere near as “bouncy” as the Acutus so I would expect even less of a problem.
The only other concern for turntables using a Graham is weight vs suspension (LP12 was always a “no”) but I don’t see that being an issue. Check first?
So your final decision must be whether you consider the SME 15 to be good enough to replace your TNT?
A wildcard thought is to suspend the TNT on an aftermarket isolation platform as an alternative.
Good luck.. :)