Just echoing what's been suggested already. A Ba Gua with a spheroid, igo-s, or a7 dripper (or an a7-oid, which is the poor man's way of achieving a Spheroid-like vape) or grab yourself one of those Micro Sticks with a spheroid or a7-oid. Either of these options will enable you to look inconspicuous although some might wonder why that strange person is sucking their thumb in public
Agree with you on those egos. Some love them, and I can see why, but every single one I've owned went quickly to ego heaven with a whimper (but not a bang, thank god).
I have been using my Lukkos Puzzlebox with a remoizer V2 dripper for many months. Fits in the hand does not look like a e-cig. Cant find anything better, this is my out and about mod as well as my travelling mod, just brilliant with a micro coil and cotton wick.