Keep it simple. I showed my wife (smoker) the things I was doing and the conversation ended with her not wanting to vape because it was to much work.
A replaceable coil and a tank that is easy for big fingers to wash out.
Something else to consider is how long is he on the road at one time. Try to get a battery that will last that long and a bit more so he doesn't have to mess with it. Or a mod that he can just switch out batteries.
Keep it simple at first. Let him appreciate not using cigarettes in an easy way.
A replaceable coil and a tank that is easy for big fingers to wash out.
Something else to consider is how long is he on the road at one time. Try to get a battery that will last that long and a bit more so he doesn't have to mess with it. Or a mod that he can just switch out batteries.
Keep it simple at first. Let him appreciate not using cigarettes in an easy way.