Correct me if I'm wrong, but apart from being a doublet rather than a triplet the WO ZS 80 FD seems to fit the bill on all counts. Like the one Humayun is selling right now
PS: forgot to add, I reckon the use of fluoride is supposed to eliminate the need for three elements, at least for slow focal ratio scopes (like f/6.9).
Cheers
Steffen.