As someone who has consistently avoided drop thumb, I really can't praise Tim Jumper's Banjo Player's Songbook enough. I caught note of the book in another thread and bought a copy. The arrangements look simple at first glance, but many tunes are impossible without drop thumb. There's no choice: you have to do drop thumb. Being forced into it, I've done it. As a very amateur player, I regard that as a big achievement. Here's the question, though. There's occasional triplets in his arrangements. What's the easiest way to play them? Or can I arrange them in a non-triplet way?
If I recall correctly, Tim uses a brush triplet quite a bit. This is where your stinking finger plays a triplet through (most often) strings 3-2-1. To get it just right, the striking finger should rake the strings. I use a great stroke, where the nail briefly rests on the proceeding string in the pattern. It takes a while to get the touch just right, but is a useful ornament.
Striking, not stinking finger. And that's rest stroke, not great stroke.
If I do not want to play a triplet, I usually just omit the note in the middle and play it as two eighth notes. When it comes to that brushed triplet, you could most simply replace it with a brushed quarter note.