I have an idea, why not just make it require 9'900 totems straight off the mark, no RNG drops. ninety nine hundred clears (maybe minus one stack of 99 if it would make trading impossible). That'd keep the content relevant for quite some time right?

EDIT: Or bundle it into an achievement for getting say 5'000 clears of Sophia Ex, and then the guy at Old Gridania gives you the mount.