The Avistar has a one-piece solid elevator. You could cut a clearance hole (semi-circle actually) at the center of the elevator. This might allow vertical access from a tail-wheel to the bottom leading edge of the rudder. Take the wire that is used as the wheel's axle, create a 90 degree bend in the wire where it would come to rest just under (but touching) the bottom of the rudder with an 1 1/2" under the rudder. Cut several strips of soda can aluminum about 1/4 x 1/2. Wrap the strips around the wire and the bottom of the rudder. Drill a hole thru both ends of the strips and the rudder, insert a 2-56 bolt and loctite a nut on the other side. For a "shock absorber" you can add a piece of fuel tubing over the wire at the aluminum strips.

The wheel collar below the TW mount carries the load so that it's not transferred to the rudder's hinges.