I hear ya, I manage some money for my mother and it is a real bitch if I have to talk to somebody on the phone at one of her ancient non online accounts. I have managed some money at ib for friends and family, but they were all men so it was not problem on the phone.
Others more knowledgable than me may comment, but it is my understanding at ib you can't set up a "friends and family" account unless you first have an account there yourself.
to OP:
Big deal about nothing in my opinion. Open an account in your wife's name. What's the worse that can happen? Just make sure she knows how to call and close everything out in an emergency. In a few years or less you will have the 10k. But only 50% are still married.