A bunch of techniques here, but they are all pretty standard and important. The hip switch/heist is my favorite way to isolate his arm in side control. In fact, I usually do a few of those to walk up the body... rarely does one switch work. It is important to keep your hips low and to pressure through your toes. I do NOT like lifting my hip up that much. It give him too much wiggle-room. Moving towards the legs is cool to open up space too, but I often end up working for mount instead (learned a really cool way to achieve the mount at Fifty/50 last year). You can combine the two ways to get higher on the person, of course.
I like to bring my knee even higher, over the crown of his head, as if in "side s-mount". I do that same way to isolate the arm, for the choke, but I often go to the north-south choke instead. That setup for the arm-triangle looks cool, though. I don't think you would give up position. You can time it to land back in side control or even take his back if he starts to escape.
