You can now choose A4, US Letter, or US Legal paper sizes with a Cricut-optimised output. The tool will export a PNG file ready to drop straight into Cricut Design Space for Print then Cut.
Big thanks to Melanie for helping me work through the printing details and debugging a Cricut when you don't own one is an interesting challenge, and she made it possible.
Would love to hear from any Cricut users once you've tried it!
David