I am wondering if CPAP machines that many seniors already have can be hacked to provide oxygen as well as positive air pressure. They already have a connection

I am wondering if CPAP machines that many seniors already have can be hacked to provide oxygen as well as positive air pressure. They already have a connection for an external oxygen generator but those are expensive and probably will be sold out fast. Oxygen generation is a simple process using zeolite to absorb nitrogen which is cheap, most of the complexity is in the valves and control circuitry to manage a two-cycle process where two cylinders of zeolite are alternately pressurized and exhausted. Is it possible to create a simple mechanical flip-flop valve that operates on air pressure rather than complex electronics?