The search for a more appropriate Allpaca type fabric as described by Sunroof has begun.
Graham,
If you haven't already check out the offerings from Classic British and German
http://www.prostitch.com.au/default.asp
Their site is clunky, a quick phone call may yield better info and prices. I bought my boot lining (Hardura) from them and found them to be pretty good to deal with, they were happy to send samples before my purchase.
Nice work and well researched, my trust in your skills is building
Cheers
Chris