I would investigate a couple of things: an oral appliance rather than CPAP (for example: http://www.sleepsilently.com ), a nasopharyngeal airway, sleeping on your side, losing weight.

These things, if they can be made to work as an alternate to CPAP for you, in emergencies, beat the heck out of being dependent on an electrically powered medical device, which is inherently "not long term".