Evenin'.
I went on my own a few years back at short notice, when I fancied a break and my riding buddies couldn't do it. Did a week in a catered chalet then moved onto 5 days with Endless Ride but only on a b&b basis. Met some dudes in the chalet, one who is a now a good mate. Saying that, I quite enjoyed the latter too, just riding and chilling at night with a book and a large glass of wine.
I'd say go for the b&b only option with one of the providers. Failing that, depending on how long you are staying for, I'd either ask about any seasonnaire accomodation, or just tell them what you require. I've stayed with 5 different set ups and they have generally all been flexible to our requirements. They may even offer you something they don't advertise.
Good luck! 🙂
Good luck!