Nursie...contraindicated??? LOL. I could tell, without looking at your user name, that you were in the medical field :) I was once in nursing, too :)
I have tons of poly thread for machine embroidery! I read on here somewhere that poly isn't good for quilting but rayon is OK. I have that, too. I think I'll give it a try on a scrap sandwich and see how my machine "tolerates" it :)
Thanks.