As ever, thanks for the advice - I like the way you're challenging how I'm thinking. The idea is nothing new, I don't even think Jack Orman could lay claim to it, especially when used in a stand-alone stompbox version. The point that I'm very badly trying to make, is that there's only really one way to raise the impedance of a guitar signal, and that's the way my box does it.
The manual I've written credits Jack Orman with the spark that lit this idea up for me, I've got all my bases covered.
If anyone would like me to make them one of these, please drop me a PM.