This could be approximated with a small number of existing APIs. Token Lock could make an token immovable. The icon could be made invisible by turning off the name and giving it a transparent png. That icon could have a token action that sends the GM notes to the chat with the GMNotes script. That would work if your information need was limited to just simple text, although you could still use markup for formatting. You could even display graphics with the code [sometextthatwontdisplay](URL of Graphic).If you had serious need for a handout, you could have GMNotes send a handout link, but you are already adding one extra click to your ideal workflow. That would add two. One for a token action button to call up a gmnote link, and the second, clicking on the link itself. What would really solve your problem would be if Roll20 gave us on-screen resizable, place-anywhere macro buttons.