I use Workman.
EDIT (2024-08-10T19:23Z): I should clarify that I am referring to the layout that you use for a physical computer keyboard, not a mobile/virtual keyboard.
Nice there is a great keyboard layout creator for windows.
If you use linux do you mind sharing your custom layout and how you did it?
On Windows it’s pretty easy. On Linux I found some shady kernel monkey patch for the Ctrl feature, but I don’t remember where.