I was just thinking about this today. When I use my passthrough I kinda feel like I've turned my laptop into an e-hookah of sorts. Seems kinda pointless to water filter vapor, but the novelty of it seems pretty fun. I'd be really interested in just having a small 12" or so, hookah shaped, battery mod with a USB port (or 4) to plug my passthrough into. Maybe a nice velvety hose cover for the wire.... ok if someone with the means is reading this please send me an estimate and build me one, that would be amazing!
Also, shisha tobacco is moist by nature usually soaked with glycerin and/or molasses. Maybe, instead of trying to make an e-hookah that vapes juice, just make a shisha tobacco that's soaked in PG/VG, and make an electronic heating element that would sit on top of the bowl of a real hookah instead of charcoal. Just a thought.