You gonna die
I do things like this
My wife is now used to it, I usually just get one of these now
Just find a way to drop it into the conversation , tell her that you've taken a punt on it because its cheap, and you didnt think you'd win it, but it now looks like you might, and tell her how much of a bargain it will be if you do. Go into lots of detail about Rohloff hubs and how well engineered, and therefore expensive, they are, how the hub is worth more than you've bid for the whole bike etc etc, she''ll soon get bored and let you get on with it
If you win, play up the positives, announce about what a fantastic once in a lifetime bargain you've got, and how it will transform your life, list all of the uses you have for it, reaaly enthusiatically, again she'll soon get bored and let you get on with it. When it arrive, gush about it , make her come and look at it, explain the superb engineering of the hub again, show her all of the super build details, she''ll just want to get away and leave you to your bike nerdiness, and youre off the hook
It works with guitars too