Ballcap, eyeglasses, headset and oxygen cannula. That’s a mess of accessories on a pilot’s and passenger’s heads. And it’s that head clutter that might make lots of us skip the use of supplemental O2 simply to avoid a nose cannula, even at the price of hypoxia.
About the only other thing you can do shy of buying a pressurized airplane is trying a headset boom cannula. I tried three of them—one from Aerox, another from Aithre and the one from O2 system veteran Mountain High. I think they’re all OK and a better option than anchoring the O2 supply line over the ears.