That's correct every flight I checked out flew into BKK and connected to Chiang Mai , which is part of the reason we decided against it.
Last we checked for hotels There was one on their list of ASQ facilities in Chiang Mai ( BP Chiang Mai Hotel จำนวน 130 ห้อง) , but you would have to give them a call directly because I could not find any additional information on their website,
I am sure in the coming weeks there will be plenty ASQs in Chiang Mai taking advantage of the opportunity.