Great Idea!
I'll champion the SRD for 24XX by Jason Tocci. It's a great, lightweight system that uses polyhedral dice for success, partial-success, and failure. If that sounds familiar to the system in Breathless in the OP, that's because it was inspired by 24XX. There's a great community for working on games using this system, and lots of innovation around the core mechanic. https://jasontocci.itch.io/24xx