Hmmz, let me think, ....
Nope, will not do that, to use your own private header, you need a way to dump your own game, so you can extract the header and use that, just you, nobody else
This way you avoid a ban.
And it's not because you paid $60 for a sky3ds, that you are entitled to play online without spending more money on games you can simply download.
IF you want to play online without worrying, just buy the damned game in the store!
I dumped my own games, i use my own headers, i have my own modified template and it's not because i have a sky3ds or gateway i stop buying retail games when i like them.
All games i want to play online i own original and all online games (and normal games) that will come out in the future that i want, i will buy when they come out.
It's you who think that buying a $60 flashcart entitles you to do everything you want without paying a cent more to play your games that need to rectify this!