Just curious, Cub, was the gun acquired before or after your marriage? The reason I ask is that if this was a sore spot with your wife then I am sure there has been some previous discussion about it. Did this topic just come up out of the blue? The impression I got from your original post was that this was a low-key issue. Why is it suddenly being brought front and center?
My bride and I are very old-fashioned. I've never heard of going to a marriage therapist for a tune-up. I've always thought that was something folks did when there were serious problems in the relationship. Please understand, I'm not dissing either of you, or your relationship, it's just an alien concept to me. If it's not broke, don't fix it. My wife and I would have to have some serious issues before either of us would invite a third-party stranger in to mediate our personal lives and relationship.
If there are no real problems in the relationship, then perhaps your wife is just looking for something to discuss? Have the usual issues of sex and money been exhausted in these sessions?
I just can't see any good coming out of this, but hopefully I'm wrong.
One final thing: I would make arrangements with a trusted friend who would be willing to safely hold your firearm(s) on short notice. I'm serious, not being a wise-ass.
I wish you well.