17 year old kitty... drama?

I’m 30 years old. I have had my little buddy for 17 years, and he is still kicking, and kicking strongly. I would like to keep him another 17.  His name is Darius. When I had him in to the new vet last time, they were shocked he was 17, and would have guessed he was 7 or so.

That being said, he freaks out if I try to move him anywhere. He goes nuts! When I moved to this apartment, he screamed the whole way over, and when we got here he ran and hid behind the toilet for about 24 hours. I felt so bad for him. 

My work schedule, as of now has me working 3, 15 hour days, and then I am off for 4. My office is about a 30 minute drive from my house.

The stage is now set.

On days I work, I usually drive home after work, clean his litter box, make sure he is fed, and pet him for a while. Then, I drive up to my boyfriend’s house, where I usually go right to bed. I do this, because it is a stone’s throw away from my office. On days I don’t work I spend pretty much the entire day at home.

My boyfriend also loves cats. He has 2. An older female cat named Charlie, and a younger kitten < 1 year old named Bastian.

Darius` brother, Meegz, died about 2 years ago. They were always cuddled up next to each other. Ever since he died, Darius screams, out of what I would think is loneliness. He does this whenever I am not in the bedroom. (His chosen turf) If I am not in the bedroom, he will bellow around the house until he finds me, and then leads me back to the bedroom so I can pet him there. This is the cutest thing in the world… however I feel bad for the guy because I can’t spend my entire life in my bed petting him.
So I was considering taking him up to my boyfriend’s house on nights that I work, so that my boyfriend, Jeremy can take care of them while I am working. Darius will also get to socialize with the other cats.
Here are my problems:
Will the travel stress him out too much? More than being lonely?
The little cat, Bastian, is a hellion. He chases Charlie around all the time… when all she wants is to be left alone, which is what Darius would want. Also, Darius has never seen another cat aside from his brother. Not sure how that would go over. I just want him to have the best life that I can give him.

My schedule is only temporary… should only last 6 more months.

What are your thoughts?