So you don't like Hell Power as a solution, even though the only ones affected would be those in the viewing distance of an MVP, which always spawns in the northern area so is completely avoidable. What would your suggestion be, considering time is a concern?
Leave it be > Hell's Power.
I've said like 50 times already that it affects OTHER PLAYERS FIGHTING THE MVP WHO DO USE TOKENS. Using tokens on MVPs is very much intentional. The problem here is only token SPAM. Find a solution that fixes that without forsaking everyone else who actually do need tokens from time to time.
That said, people have suggested limiting the number of tokens you can carry, after which you have to kafra card or buy from kafra shop directly, both of which involve using actual $ which benefits the game, not related to GFSS.
A short re-use delay on tokens would also be okay, like 10-15 seconds. Basically anything that specifically only affects token acid bomb cheese, and nothing else.