Thank you Ken! I have bookmarked the chord wizard, and expect I will be consulting it often.

I have a copy of Merv Rowley's definitive article on Chord-Melody playing in DAA tuning  -- An Approach to Learning Chord-Melody Style .  The chord-charts there do not include any plus frets because it was written for those of us who only have pure diatonic fret layouts -- not even the 6+ fret.  

Your best bet in to learn to use the Strothers Diatonic Chord Wizard:
Tom & Missy Strothers | Diatonic Chord]

updated by @ken-hulme: 08/16/23 03:55:05PM

Do you have a comprehensive DAA chord chart you could post? The chart I have shows only D Major, E Minor, F# Minor, G Major, A Major, B Minor, E Major, C Major, and C# Minor. I am especially interested in what additional chords may be formed using the 1 1/2 fret. Thank you!