I'd love to have a middle ground; I'd like to provide a diagram generator with a layout template and layouting hints, then have a tool generate a diagram confor

I'd love to have a middle ground; I'd like to provide a diagram generator with a layout template and layouting hints, then have a tool generate a diagram conforming to that layout. I feel like that would be the best of both worlds. I could emphasize boundaries and structures visually, but I wouldn't have to keep everything updated by hand (as long as things don't drift too far).