I totally understand your feelings about the IM shot. I am in awe of the women on here that give it to themselves. I don't think I could do that. For the longest time, I had my DH doing my SQ shots as well. But after a really weird cycle following a retrieval cycle, I ended up with elevated LH and despite my body's attempt to surge, it looked like the follicle didn't do a good job (lowish P4 and E2 started going back up instead of dropping for a few days). We were in the middle of a hurricane coming and my DH had to leave to go help his mom who was going to be in the eye of the storm. So, I was on my own and that is when I did the SQ HCG shot. It worked and my hormones did what they were supposed to at that point. I think if we had left things without the trigger, I would have had a cyst at the baseline of the next cycle.
I also understand your feeling about dealing with docs other than Dr. Check. It never hurts to question things if you feel like you should be doing something else. But I think in this case it is a judgement call that even Dr. Check might make.