Have flown lots of sensitive aircraft but the most difficult are flapped gliders with an aft c of g..if you cant get your hands on a good microlight then do a bit of gliding which will teach you coordination.
Definitely dont just do some gliding and expect to be coordinated enough to fly a midget racer, you will kill yourself, the rudder sensitivity is light years apart. And a microlight as a lead in is equally bonkers for something like a cassutt that doesn't like being flown in the circuit at less than 120mph. The lack of inertia and control sensitivity will at least offer something towards the experience however at half the speed....