One refinement would be to split the device in to two parts = the mask/tube/sensors and the electronics and battery. Then, the a large portion of the weight could be moved to the back of the headband or a fanny pack reducing the load/torque/etc. on the face.

A lot of headlamps do this for example. https://www.petzl.com/US/en/Sport/SPECIALIZED-headlamps/DUO-...