I've been eyeballing the Eleaf istick as my left pocket device. They should be available in the states now. If not, it will be any day. I believe they can be locked before you put it back in the pocket. The Nautilus mini & stainless tank would be a good match. Fill and go. It hasn't leaked on me yet.
The Vaporshark dna has been my right pocket device of choice lately. There is a rebuildable kayfun nano atty on it and a protective "shark skin". Up/down or all three buttons can be locked. The kayfun can leak if they have a bad o-ring or bad build. It took me some time to realize all of these issues. They are very solid now with the current build lasting for over a week. Not a drop has leaked.
There are some downsides. The istick and vaporshark have a built in li-po battery. The service dept. or an electronics tech would need to swap out a bad/weak battery which turns people off. I doubt that any of these li-po units are as safe as an IMR type battery.