I won't question the need for a tracheostomy. I will say that I've been on APAP, which is an automatically adjusting CPAP, for about two months and have noticed great improvements to my daytime sleepiness and some changes that indicate the heart is doing better not having to struggle with the frequent oxygen desaturations.

CPAP is rather different than BiPAP. BiPAP is usually used to treat what is called Central Apneas. This is where the problem is not from tissue obstruction but due to the brain not telling the body to breath. Most apnea patients have this to some degree. I do too. CPAP is a constant air pressure where BiPap is Bilevel pressure, which is a high and lower pressure in sync with your respiration. The APAP that I have is a CPAP that automatically searches out the needed pressure to overcome obstructive apnea by monitoring the breathing timing and sensing vibrations from snores. Some have a feature, sometimes call EPR which is kinda sorta like a BiPap but is not timed to the respiration cycle but instead drops pressure upon exhaling to make it a bit easier to use for some people rather than a constant pressure to breath against. I have mine disabled but many people like it. Sorry if this information is not pertinent to you, but I thought other readers of your question might like some further CPAP-Sleep Apnea info.

To offer some additional hope for you, I have read a story of a person with heart problems that had it diminish greatly after three years of CPAP therapy. I hope similar improvements are seen by you with your treatment.