I don't wish to be depressing, but if Remicade + methotrexate didn't work, you don't stand a chance with Humira. Arguably, Remicade is the better med or, at least, has more clinical evidence behind it than Humira. I think your doctor is right not to waste time with increasing the dose of Humira.
By all means try the SCD. It's something which seems to have a marked success for a few people. I tried gluten-free and liquid diets, none of which made the slightest bit of difference. But if you have never tried a restrictive diet, it's worth a go: you might be one of the ones who respond very well to diet modification or you might not. It's all a total mystery, to be honest.
Re helminths, you can still get them from this site as far as I know. autoimmunetherapies.com/helminthic-therapy-worm-therapy-index.html
I dunno what they mean when they say that 'no one is denied therapy on financial grounds'. Last I knew, it cost a fortune. If it's free now, I'm gonna kick myself a million and one times for not trying it before surgery.
Stem cell, or bone marrow, transplants are still in the experimental stage for Crohn's. Outside of clinical trials, it will not be easy to obtain. But here's one success story about
Edit: Oh yeah, and there's anti-MAP triple antibiotic therapy, but MAP is a bit old hat if you ask me. If they haven't managed to conclusively pin Crohn's to MAP after decades of trying, I don't think they're ever going to.
Best of luck with whatever step you decide to take next.