From own experience, both mom and dad, I'd advice a simple light ego style start kit.
Simple tank on it with replaceable coilheads which is easy to maintain. Make sure there's 2 ego batteries so he don't have to do without while charging.
I gave my mom one her bday, dark red with evod tanks and my dad stole the 2nd one in the set.
Ended up buying him a set the month after.
Supplied coilheads for a year or so until I explained them where to order. My mom immediately stopped buying cigs, stealing an occasional hit from dad and both totally dropped analogues after about half a year.
Edit: even after 1.5-2 yrs neither shows an interest in my gear and are still totally content with their egos, replacing them as they go dead.