Of course it's definetely not a good idea to do anything like that in an acquirer like CSI (FDMS) where VISA stays at day and night with a SWAT team ready for intrusion.
There though it's gonna be relatively easy to change the merchant account to adult MCC coding.
By the way, does anybody know how is it possible to put different MMC codes on one merchant account? It must be possible, because in the system as far as I know the code applies to a transaction, not to the whole merchant account.