So I tried out some practice insertions the with macro webcam. Turns out depth perception is indeed important. Also annoying was my webcams sluggish exposure auto adjust when adjusting the cam and light angle. After about an hour of mostly jabbing my probe into space I managed to be able to get insertions down with some regularity although still slow and I didn't actually turn my machine on. Time delay and frame rate with my Logitech C270 wasn't an issue.
Definitely harder than with the mirror but for hard to see areas still an improvement. Hoping that working with the lack of depth perception is a thing that you can get better at and seems like it is so far. Keeping my finger tips clearly visible in the frame helped a lot. And the lack of depth perception for the webcam is worse than like keeping one closed depth perception, maybe the narrower depth of field or angle or not the best resolution causing it.
USB handheld microscope on Amazon for less than 50 bucks. Celestron....go for the lower power one.
But the webcam mod is free :] (if you already own a usb webcam)