I mean, the risk is low, and so far GF/TPCi hasn't outright banned people for possession of illegal mons,
but so far low risk isn't equal to no risk.
The cases of bans so far, isn't for having hacked mons, but rather for using a CFW device.
So as long as CFW is detected on your device (even if CFW is only in emuNAND, they may detect that your device has CFW or a emuNAND usage nonetheless?) they can still ban you?
We don't work for any of them, so we wouldn't know how they function, how they detect, their rules etc.
All we can tell you is no matter what you do, there will be some risk.
All we can help you is try to lower the risk.