Or make a front mount and buy a second hand PTO shaft to butcher? They're quite cheap. I'm sure it would be simple enough to fabricate a plate that mounts on the front of the chassis? A Hycrack is light enough to pick up and mount by hand?
There's a part on the AV site that rigid mounts stuff on the back - don't suppose it would take much to adapt it to fit the front?
Oh, and if anyone spots a used front or rear linkage I may be interested depending on how this weeks purchasing plan goes...