I have heard Jerry play 1st and 2nd position, just like a Cajun single row accordion player plays C and G on a C accordion.
Jerry has taught his approach at SPAH in Joe Filisko's afternoon workshop mob. Jerry said he grew up using harmonica to imitate his father playing accordion. The theory of it is easy, but you have to be good at tongue block rhythm and learn the chords and splits. I did not have those skills at a level to sound right in my attempts.
Richter is just a name for the tuning scheme used in Marine Band and Special 20 Hohner harmonicas as well as many other diatonic harmonicas in other brands. ----------
“Richter” is a term which gets used in association with the standard German tuning scheme which is so commonly used on Richter diatonics, but it isn’t the name of the tuning scheme. A ‘country tuned’ special 20, and a Lee Oskar ‘melody maker’ are both Richter harmonicas. ‘Richter’ is the name given to the construction method of these harps, whereby there is a vertically divided comb with a reed plate both above and below, with blow reeds on one plate and draw reeds on the other. Contrast this with the Knittlinger system used on many tremolo harps and chromatics, where the blow and draw reeds sit alongside one another in pairs and the body of the harp has a horizontal division as well as vertical.
There are multiple conflicting opinions on "Richter tuning" available on the internet.
In common usage "Richter tuned" has often been used to describe the standard German tuned diatonic note layout, which is what I did above. However, as you point out, Richter is more accurately a description of the system of reeds with one reed on the top and one on the bottom in a sandwich style layout. Pat Missin goes on about Richter here: