If you can't work, you need to get a Social Security Disability Income application started. The longer you wait, the less you will receive.

If there are sleeping positions where you breath OK, try to sleep that way. The spooning direction may be OK but when you roll over, you may cause your CSA. Getting good safe sleep is far more important than snuggling with your wife.

CSA can cause a cumulative brain damage over years. My father suffered from untreated chronic CSA. It slowly took his cognitive skills over 30 years.

The 'mouth mandibular thingy' is for Obstructive Sleep Apnea. It is difficult to treat CSA. Most sleep specialists will try to use OSA treatments for CSA problems.

There are recording Pulse Oximeters with alarm systems. There is also a diaphragmatic pacemaker that triggers the diaphragm to contract. It requires surgery to implant a receiver on the phrenic nerve and a belt with a signal sender is worn at night. It causes a jerky breath. http://www.averybiomedical.com/

It sounds like you could do some sleep position/posture modification to help your breathing rather than taking extreme steps.

I don't even get in bed until I am drop dead ready to sleep. I start to fall asleep in my recliner then I get in bed and am asleep in a good flat on my back position withing a minute.