I had also long searched @gerrymcil 
Here's an example of how to take a screenshot with Snagit using different palettes (including representations), edit it there and then forward it to Yoink (all in real time).
I don't use shortcuts. The palettes always appear at the cursor. One mouse click is enough.
I call the palettes with a BetterTouchTool gesture (Mause or Trackpad).
I can provide you with my Drafts palette (tweet above). I would also like to make you a video, what you have to pay attention to.