Wheee! Dick - just had a great time playing along with the "Blarney Pilgrim". Dm is a nice key for it, and I enjoyed a whole raft of chord substitutions in the themes. For example, in the opening theme, I experimented with: (each mark being 3 of the 6/8)

Dm / Dm / G / C / D / ...and then
Dm / F / G / C / D /

I also tried various substitutions with the other sections - too numerous to name here. However, what seemed to me to be important here was that, if I was playing along with you, I'd be concentrating less on chords than on getting an appropriate bass line that wove into the tune in a melodic and rhythm way. Counterpointing, yet underpinning, if you get my drift!

PS: Have you heard Duck Baker's take on this on solo guitar? Excellent version.

PPS: Would have loved to see your fingering on the video...