A number of us have made our blades hydraulically adjustable. No need to "lash up" anything. Rather easy to do it correctly. What you need to do is add a by-pass block, a Pressure Relief Valve, a used Cub Cadet Cessna Eaton Valve, some hose and a hydraulic cylinder and voila .. you have an adjustable blade from the seat.
Here is a pic of my Ellie a 48 Cub 6 volt with a hydraulically actuated blade.
I got lucky . the by-pass plate was from a close friend, the cylinder cost me ifn I remember correctly about 50 or 60 bucks, PRV was about the same, hose was around 50 bucks and the valve I got off of e-Bay and it cost me less than 20 bucks. So a little time learning .. and you can have what you want and the satisfaction of building it yourself. I can search the archives to see what it actually cost but it is somewhere in the neighbourhood of $250.00 or so.
Search here for Cessna Eaton Valves, Pressure Relief Valves etc., and you will find a number of threads that refer to building such a critter along with a few other interesting items.