If you do end up having to go down this nightmare path, the book "Analogue IC Design: The Current-Mode Approach" (ed. Toumazou, Lidgey, Haigh) has a lot of interesting stuff. (There used to be a PDF floating around but I can't dredge it up now. Insert the usual comments about the good old days here.) It is a slog of a read and most of it is the usual academic... stuff... (I think this is one of those staple-together-chapters "books" academics do) but especially in chapter 4 (and kind of in 3) there are some ideas that are applicable. They're a bit far out, but you're going to need far out, because this is a hard design.
How much output impedance are you thinking will be needed? That is where the cascodes really start to come into play.