I saw your post a few months ago and already thought it was awesome. Congrats on quitting your job to devote yourself to this project. I would assume that you have considered joining YC?
I'm the founder of the OSS project windmill [1] that, among others, separates the code logic from the management of secrets. We are in the same boat of being a small team doing too many features and hence have covered very lightly the secret management. I would love to see if we could write some integrations between our projects so that scripts and workflows could leverage advanced secret management.