You could always do what I did at the beginning of this year. I just ordered one of each of several new things just to try. I found some things I like, some things I hate.
CE2 - doesn't wick well enough
CE3 - way too hard to fill - my vision isn't so hot!
X7 Micromizer - yuck
Cyclone Vornado - haven't tried it yet
CE2 Giantomizer - good, but a little muted
EMDCC - good
DC tank (with DC that it came with) - good
DC tank (with SC 2ohm instead) - good
Sapphire - good
Stardust - good, just slightly muted but very usable
When I read about your husband, I thought of the Sapphire because it comes with a cylinder and cap cover. Here's a picture of the sapphire with the cylinder and cap:
That makes it very safe to keep in a pocket or throw in a purse. But, it's a little long unless you use it with the short little 650mah Ego-style batteries. He could carry an extra battery if needed and maybe a little tin with prefilled Sapphires (which, of course, you would fill for him the day before). That sounds like a good plan, assuming he even likes them.