But, again, they're all still the same chords. If you know what they are in standard, you know where they are in DDD.

It's not about needing a chord chart. What you're describing is the need for someone to know WHAT they want to play with D drones or in those keys. That doesn't require a chord chart. That requires folk process sharing (what other do) and experimentation.

Again, if you know what chord you want to play, you don't need a chord chart for DDD.