As I stated before, it's a tough call for you and I feel for you as you struggle with this dilemma. I have a couple more comments and thoughts.
One, as I mentioned before, some people just never get a response to 6MP, no matter how much or how long they take it. Does the fact that you got no improvement mean your stricture is all scar tissue? Probably, but maybe not. Maybe you're just a non-responder to 6MP. So, again, you're back at square one: Is it inflammation or scar tissue?
You said your doctor believes Remicade or Humira are too risky? But he's recommending surgery? Uhm, to be blunt, that's crazy talk.
How can Remicade/Humira be more risky than putting you under anesthesia, cutting you open, and removing however many inches of intestine, then closing it all back up....
I would venture to say a great majority of docs would disagree with your doctor's position on this one. Surgery is almost always considered more risky than these meds.
Having said that, I'm not trying to scare you out of surgery, and I think its risks aren't very high. But they are definitely there (I had a sinus surgery go terribly wrong, a surgery that was supposed to be "routine" endoscopic surgery, so I'm a bit biased here, admittedly.) What did somebody say about surgery? "The only minor surgery is the one done on somebody else. Any surgery done on you is MAJOR surgery!"
I would advise you to reconsider trying those meds. I'm not saying "do it"; I'm just saying consider it more. If it turns out that your stricturing is from scar tissue and these meds make it worse, well, you'll have surgery, which you're heading towards anyway, so no net harm done (yeah, I know, easy for me to say!)
One other possible thing to consider, which would not be fun to try at all, is an extended period of time (weeks? months?) on basically a liquid diet. Some people get a good response from that. But, yeah, that might be really tough to do.
Good luck whatever you choose to do.