Using qmk.sized.io to create firmware for a Gherkinhttp://qmk.sized.io and upload the json file. The Wiring and Pins tabs are filled in and complete. You will need to complete the Keymap tab and anything else you want to edit.
I was going to create the same keymap as I have in TMK, but the clicking got tedious. Not my way of programming. This will however be useful for anyone who can't create a working dev environment to natively compile the TMK firmware.