No they're not.

When I got my apnea diagnosis, the masks/PaP didn't work for me, sleep specialists said the implant wouldn't suit my case, and I was underweight.

I'm hoping a few surgeries combined with more typical therapies will work in the end, but if not then I'm an outlier. There's plenty of people in that position.

Regardless, they specifically said they have complex apnea. They need to treat the central apnea alongside the things you're talking about, some (like the mask) can actually make centrals more frequent. It can be a very difficult thing to treat.

You've probably already come across this information but just in case you haven't, that's a common symptom of sleep apnea or UARS. UARS is often difficult to spot outside of a sleep study, and both conditions can be treated. Might be worth looking at.