Hey there! I'm the other half of Depot. This is an awesome tool you have built, I have actually been looking for something like this for myself as well.
Couldn't agree more with the pain points you mention, it was the biggest things that led us to start Depot and we're really excited about what we can do next.
If you ever want to do way with your hacky build process and try out Depot, we have a free tier now.