First off, he has to want to do it...if not, he will be hard to convince.
Are you near by...can you fill several cartos for him to use for a few days at a time?
You don't say how old your father is...but I'm 61...so maybe I can offer some rambling suggestions. With the v2 (that's a kr808d cig-sized, right?) the eSmart or Kanger T4 are small easy to use clearos (litecigusa.com). Cartomozers would be much easier, and can work well if they are new (not well used)...plus, you can fill a week or more worth of cartos at one time. I know when I started (40 year 3 pad smoker), I found that a cig-sized with cartos seemed pretty natural to me...similar to smoking...and I could fill 10 or more at a time for several days of vaping. Only later did I begin using clearos and larger batteries.
He will likely be happier with a tobacco type flavor to start...but since taste is so subjective, you may have to get several samples for him to test. At least in my case, the correct flavor was harder to find than the correct device. And, since taste change as your taste buds recover, this can be an ongoing process.