Yes, I have pondered that myself, for building strength, and there are surprisingly few solos that are basically all chords. The Bach-Grandjany etudes offer a few, two adagios and a bourree. There is the original Bach-Salzedo Bourree and Salzedo’s Londonderry Air, some of his Christmas pieces and to extremes, the Prelude Fatidique, Bolero and Recessional. Dewey Owens’s Bach Chaconne is fairly chordal. Gaubert’s Sarabande also, but those are concert solos. It’s a short list. The Pavane in Solos for the Harp Player is of course, there as well as some Corelli pieces.