Pepper spray... I will work over time if you get enough in there. You just can't keep your eyes open or breathe too well (at least with the stuff mixed with tear gas). I think tear gas works better, but it has the same effect. Eventually your eyes and throat swell up and you can't carry on the attack nearly as efficiently. But someone who has been exposed to it a few times can take it better. Even those Davis students stayed put after being sprayed. It isn't magic, but as they say, "better than nothing".
As a side, in basic training, we took off our gas masks in the gas chamber. Man was that funny, I went through kind of early so I could chill and enjoy the show. Snot boogers three feet long! Eyes RED! We were told we'd get a weekend off if anyone could say the "Infantryman's Creed" after taking off the mask. Nobody did it, and believe me, I tried real hard.
The Kimber tool looks nice, but I'd want to test it out, and with goggles on to see if it really has the velocity to go around them. Anything non lethal you plan on carrying, you should try it on yourself, if for nothing less than to know what to expect when you use it --not all of it goes downrange and only on the bad guy, you might get choked up too.
You may have to convince your wife that she can spray you too... I know mine wouldn't be too cool with it, but it sure would be funny! A fun prank I did as a kid was to spray it in window fans in the summer... Our buddies inside choked, sniffled, sat there... Then PANDEMONIUM! I don't advise this in today's nanny state, but if you do, make sure they don't get hurt running out.