I totally agree with that second point. The first point, is debatable. 2 days a week of weight training will probably maintain what strength you have. To get any significant results, I'd be more comfortable with you training 3 times a week. The trick will be managing recovery, and hitting MMA with full energy (both of which can be achieved by monitoring your nutrition, and the intensity of your resistance training.)
To start with, isolation moves aren't high on my list of exercises for athletes, especially martial artists. But let's not call them Cheat Curls. Let's call them Power Curls, or, like Dan John has called them, Reverse-grip Cleans. Does that make more sense now?
They're a great upper body move, which complement heavy rowing nicely. I have no problems with grapplers training bis. Strong biceps are crucial for keeping chokes locked in, as well as grabbing and initiating many throws. Big biceps, however, may not be so important.
I don't think they're as involved as everyone thinks. If you're not competing in Olympic lifting, adn aren't injuring yourself (or setting yourself up for injury), you can "teach" yourself to clean by starting lighter, with low reps, and progress at your own rate.
Well, I don't like B-T-N presses for a handful of other reasons, but that one's valid enough. Stick with Militaries (standing, of course). As for the squats, back squats are a Super-basic exercise that anyone with 2 feet should be doing.
If front squats bother your shoulders, try playing with your grip width before cleaning the bar to a solid rack position. If it's still bothersome, don't do them, problem solved. You can progress fine with back and overhead squats, all sorts of deadlifts, step-ups, and lunges.
I'd look into finding "Science of Martial Arts Training" by Charles Staley (search for "Charles Staley" on Froogle.com, I believe it's out of print, but I found it there). It's an awesome resource for...Martial Arts Training.