I’m also a CPAP user. I’ll be honest and say that since using it, I’ve booked at low cost hotels. This comes after attempting to give an outlet at Orisson and couldn’t be guaranteed a bed near an outlet. Had difficulties at one other place also, but when I make these plans, I never intend on using public albergues 100% of the time anyway. Even if starting in SJPDP, there’s a wonderful place at Huntto with outlets, and the 2-1/2 km distance between the two places shouldn’t make or break anybody.
Another thing to consider is that some luggage transport agencies specifically do not want to transport medical equipment— it’s my understanding that they don’t want liability in case of breakage. I strapped mine onto my backpack, lightened everything else I carried and was fine. I would check to make sure they know it’s medical equipment you are asking them to transport.
All that said, having the CPAP with you will be great. I know two others who have them and have done the Camino—it’s just not that unheard of anymore.
Wishing you all the best! Buen Camino! And for the sake of others who need to use CPAP’s, if you hear anything different from my experiences, please report them. As more able bodied people need to use such things, the system is bound to develop more accommodation towards using them.