I have a properly executed "gun trust" of which I am the "settlor" and primary trustee. Through the establishment of the trust, I transferred all of my firearms to it. My wife and son are are named as trustees, (and primary trustee in succession upon my death).
The trust also allows me to register NFA items with the trust as owner, and thus any trustee can use the NFA items.
My wife and son ARE "gun people", as opposed to the OP's wife. So my wife and son will keep the guns they want, and (presumably) sell the ones they don't want. I won't care - the arrangement has been made so that the state doesn't make any decisions.
For the OP, I'd suggest looking into the same sort of arrangement. It will keep the state off your wife's back while she sorts out what she wants/needs to do.