Harmony notes/chords
General mountain dulcimer or music discussions
Are you familiar with naming chords by Roman numbers, eg., I chord, ii chord, etc.? If you are, try using the ii and/or vi chords [MOOC info]. ii chord in D is based on the E [EGB, (Eminor)], vi chord is based on B [BDF# (Bminor)]. In G, ii is based on A [ACE, (minor)] and vi is based on E. I don't remember exactly how they're used, as replacements for the IV/V chords or in line with them. You could also try using the dom 7ths, the basic 3 note triad plus the flatted 7th, in place of the major chord, for 3 strings try dropping the 5th [last note] of the triad, eg., D=DF#A; D7 = DF#AC; 3 stringer = DF#C. You could also try dropping the 3rd instead of the 5th, eg., DAC. Major 7ths may work, basic triad plus 7th, eg., DFAC#.
This is all stuff I just learned so I don't really know how well it will work.
From what I learned in the recent MOOC, chords are, essentially, harmony, if that helps.