Lucky 13

I played Paddy Richter harps for a few years. They are good for playing melodies in first position but not for playing melodies plus chords. I play tremolo harps or standard Richter harps for chord plus melody. I play Lee Oskar Melody Maker harps sometimes for single note melody because the bent notes on them allow me to play more tunes than the Paddy. I sold my Paddy Richters or retuned them to Melody Maker.
If you want to try some tunings get a Lee Oskar Melody Maker in G and a Lee Oskar major diatonic in C. Then swap the top reed plates between them. You will have a Paddy Richter in C and a Country tuned harp in C. Play the Paddy in first position C and play the Country in second position G to see how you like them. If you don't then swap the plates back and you have a nice C harp plus a Melody Maker. If you don't like the Melody Maker then buy some replacement reed plates for it in standard tuning in a key you need. For a reasonable investment you try 4 tunings and end up with 2 nice harps.
My first 4 Paddy Richter harps were standard diatonic harps that I retuned myself. Only one note is changed.
Melody Maker is also not good for chord plus melody style play. But it is great for single note melody.
Asian tremolo harmonicas play melody plus chord OK and also have the missing note that the Paddy gives you. You get that note on the draw so the blow chord stays major. The draw chord is OK because tremolos use partial chords due to the distance between notes.

I had a lucky 13 for a couple of days then traded it off. Didn't like it.

I've made a video of an old Hit-Song from 1978. I used the Lee Oskar Country Tuning
for some parts and I'm happy with the harp. Now I can make renditions of our Marching Band tunes, like this song:

youtu.be/6lZZYgtO7JQ