Maybe an email campaign to botanical gardens? Ask first if they HAVE it. THEN ask for a cutting.
This seems to have a list of clubs and societies, one of whose interests is Ficus.
http://www.bonsaiginseng.net/f...
There is a Facebook group calling itself the ""International Ficus Society"".
I don't know what academic department would focus on Ficus, but you could get an infinite number of email addresses that way, to ask if they know someone else you could ask.
Good luck!