Almost forgot... over on Peter's webpages, there was the Basler conversion, which looked pretty spiffy compared to the Stolifter.
http://www.skymaster.clara.net/spectrum.htm
The probable reason none of these 'conversions' caught on was their very high R&D initial costs, plus fairly high hourly operating costs.
Be happy with your TCM's... they're more fuel efficient. Besides, what other pressurized light plane do you know of equipped with R/STOL, that can touchdown -or liftoff- at 44 knots and cruise at FL200 at 205+ Knots, that can be had for anywhere between $79,000 and $225,000? I only see the Skymaster in my 'viewer!'
SkyKing