Here’s a workflow (now Shortcuts) that you can use, if you have iOS, to add a commitment to your commits.to and to your iOS reminders at the same time, both with the same deadline. (You can just change the reminders step to whatever your to-do app is if you use something else.)
https://www.icloud.com/shortcuts/031590f87d434b84a9b97335fca16355
I’m including a png of the full workflow, if you want to see what it does first.
I hope this is useful to others out there!