I said I'd do it ages ago, and I finally have. ZirconSwitch revision 4 is now available as an open source control. You can find the project at GitHub, which has a zip archive for the full download in the releases section. The product page has been updated too.

This new version is built using Xojo's API 2, so it requires Xojo 2019r2 or newer. The design has been updated to modern UI standards, so if you don't like the latest flat design trends, well then I'm sorry to disappoint. The control is backwards compatible with older versions of the control, though control sizing has been deprecated. That's not a bad thing. Rather than three control heights to choose from, it now renders the full height of the canvas so you can size it any way you wish.

And being open source, it's free for everybody. Have at it.