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It helped me to hang the hose down my back, rather than the front which was my habit during the rest of the day. That way the cannula would not be u dear my chin as I washed my face.
My experience was that the positive pressure of the air coming out of the hose kept water from going into the tube. I would never submerged it, but the splashes of shower water posed no problem for me.
I agree about a shower stool! Sometimes you just need to sit.
I was able to do away with the supplemental oxygen after my lung transplant last year, but I was on oxygen for a year and I know it is cumbersome to contend with. I wish you all the best!