Mine won't work for you, . . . but FWIW, . . . there is most of the time a hand gun of one sort or another on my desk 10 feet from my computer, and 10 feet from the front door.
Normally, there is an ungly green wash cloth just "dropped" on it, . . . without giving away the details of what is under it. Looks like I was polishing my boots or something, just piled it on the desk.
Actually, in your situation, . . . I'd probably opt for a finger button safe, . . . or personal carry.
The other thing I would do, . . . I would sit down and have one of those old fashioned "down home" heart to heart talks with the anti gun individual. You can be firm, without being rigid, . . . and strong, without being harsh, . . . and inform them that there are weapons in the house, . . . will be in the future. Put it in terms of loving the person, wanting the best for them, and protection is just one fo the "bests" you provide, . . . weapons included.
I more or less had to do that with my daughter in law, . . . and while she is a very open and loving person, . . . I don't think the first time it was mentioned that it went down real well. She accepts the whole thing now, . . . including my son and his CHL, etc.
May God bless,
Dwight