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Alan, I'm puzzled about what you're trying to do. According to many discussions on this site, "chording" is incompatible with "Irish style". Occasional harmony notes or octave playing, but not a regular underpinning of chords. That's "English style".
But Jim, haven't you missed a few discussions of lately?
I had the impression that "melody only" approach is not only out of fashion, but has never even been an "approach". It seems after all the discussions, that melody only was a short lived branch-out, esp. if you watch young players with Anglo concertina. I was quite impressed with those Young Irish players on Youtubes, that Leo put together.
Full and rich harmony, cleverly applied, nice rhythm, skillfull sinkopation - very serious competition to "established" players, technically not any worse, to say the least.
And what is this contrast between "harmonization" and "chording"? Aren't chords - harmony? Why harmony on the left, melody on the right is considered "chording" and belonging to "english style", and "harmonization" is opposed to it?
If I hadn't a music teacher, I'd be completely lost by now and probably picked up a few wrong ideas.
The question posed was a good one, but vaguely composed.
Really, is the question about fingering the all possible chords on C/G Anglo, or only in D?
Alan is looking at single line dots for Denis Murphy's slide and wants to add harmony, but probably can't find the right buttons at the right moment.
I'd suggest to find piano or accordion arrangements for Denis Murphy's slide.