Semantics aside, I'm not sure this is a really bad idea, just one I probably wouldn't implement without a lot of study...
I've noticed these .410 "revolvers" at the gunshows of late...Look like 5 shot models...3-4" barrels, pretty solid manufacturing from what I can tell...Don't recall any particular maker, just because these things have only caught my eye in passing...
Next time I roll through one, I may take a closer look...
My philosophy behind a lot of my self-defense methods is basically if you can't get it done with the load-out you have on hand, best to be on your way out and away from the threat...This one facet based upon the idea that I have not had much use for a BUG of any type...
Thats not to say I haven't thought about it after hanging around some of you guys and gals over the last 15-20 years...
My normal load out is that G23 (13+1) and one spare (13)...Thats it...
If I had to conceal another pistol like this...Thats just one more thing I have to think about keeping concealed, secure, and safe from accidentally shooting myself everytime I have it on me...
But this is just my opinion...