What a great idea. I am going to steal your idea some time. My mouse gun is a small revolver that would not fit and as I am trying to stay true only having two pistols nothing I will/have is going to fit.
Karma is Good. I'm told Astra's, Sterlings, Baby Brownings and many more may fit too. I'm sure there are others. You be the judge,
If it might fit, you should enter. Karma Bump.
I will take a dreaded spot. Many years ago I purchased a Raven 25 acp. Acouple of years later I purchased another for my father. Now I have both guns and its cheaper to shoot my 45 acp S&W 4586.