Let me be a little cheerleader for you. I had the endobronchial valves installed two years ago. I am a 73 year-old woman, stage 4 COPD, and I was on oxygen 24/7 for three years. My pulmonologist has done several dozen since mine, which was the third he had done, and all had good results. One man had him remove them, because they sometimes make a little whistling sound.
I would give it a hearty two thumbs up. So many people want to have them, but their conditions are not right. I would re evaluate the decision. They will add years to your life. After a month I was not using oxygen most of the day. The improvement continued for several months, and normally I now use oxygen only for sleeping. Please think about pursuing it. They have been FDA certified for public use for three years, and only covid has stopped doctors from doing the procedure. There is no surgery, so no recovery time.
Life can be so much better! Please let me know what you decide. I would be about exactly where you are, had I not had the valves installed. They said I had bout a year until hospice.