So what you're saying is, effectively you want to use PKHeX on your "stock nand"?
This should go without saying, but PKHeX is a save editor, not a nand editor.
So it's up to you whether you want to have an edited save on your "stock nand".
No one works for GF here, so no one knows for sure.
I'll recommend you to have a "healthy amount of items", not x999 of some mons.
No reason to have 31 IVs on all stats, when you can just hyper train.
No reason for them to ban for EV split, since that is what people normally do in-game, for online competitions.
Thus far, it appears they only do Switch bans for not save editing, but rather for having CFW.
However, it is important to note that save editing (if you have anything on it that is ridiculous, for example) is one way to prove you have CFW.
It is also against our rules to use significantly hacked mons online, so don't ask about it okay :3