Just trying out some of the great new features and Actions in KM11 and I came across the new "Prompt for Snippet" Action.
It is designed for prompting for snippets of text that are then used in text expansions, but it can also be used for creating/editing the text in multiline Variables. Here's just one example:
KM11 Prompt for Snippet to Edit Multiline Variable.kmmacros (3.7 KB)