I don't CGM (hopefully next upgrade) but I do have a Medtronic pump and love yoga. I actually wear my pump between my legs in a thigh strap during practice. Keeps it protected no matter the position and I don't have to slide it around my waist band. I suppose if I ever reach a point where I can bring my foot all the way up to my thigh for Tree that could be an issue, but considering I currently place that foot all the way down to the floor it's going to be a while until I cross that bridge
I'm not an instructor, but I actually designed myself a modified Sun Salutation with no inversions--I have a history of diabetic eye damage as well as glaucoma so my eye doc doesn't even want me going Legs Up The Wall. When everyone else in class is having upside down time I usually go into Reclined Cobbler.