Thanks, Bill! That was my hope. I found a lab in town that does bulk sample testing and could analyze a piece today though they are not at the certified level of somewhere in VA that another co was going to send it but take several days (like 5 bc of weekend). The local lab found no asbestos. Given also that all signs lead to original 1929 plaster work, I think I can put my anxiety to rest now. There were a few hairs I noticed in that first coat with the keys, presumably as you say cattle or horse. If that’s really the only layer where fibers would’ve been added to then I think that’s another indication of original 1929 job. Thanks for your comment!