Get a new partner. My wife doesnt care if i make my own gear or buy it from around the world or what the hell ever. cant imagine trying to hide this sort of thing from a partner.
Yeah....I cannot even imagine. Not to turn this thread in that direction.... but if its that bad, why bother? The kind of loving partner who would likely turn your ass in to save you from yourself. From being one of those awful people the media tells us about. You are asking for a big mess.
If you aren't married or don't have kids AND....this is a passion for you then move on. She WILL find out sooner or later. If she doesn't roll over on you then she will tell her friends, her parents, everybody ect.... Then what? You try and kiss ass to stay together and get rid of something in life you love to do so you can keep a girlfriend or wife happy? Fuck that. Say what you will but I have been here 12 years and I have seen it all from guys in your situation.