Hi, I totally understand and actually have a rule in my listing which states 'Guest(s) without their personal photo on their profile/ blurred photo, please contact me prior to booking; we will also require sight of your passport as photo ID on arrival'. I will nt compromise on this; In addition they have to be verified by Airbnb. I have Instant Booking but I would decline anyone who books my room without meeting my criteria.
I believe the guest will get the decline message; I've received responses from the guest in the past when I have declined and sent a message. Airbnb notes the reason which you provide from the options.
Ama