Good stuff!
It would be nice to have a built in scripting language for rendering in Rack! I dont use svgs and I wrapped nanovg in a way that makes writing draw code less verbose and have an editor module that lets me arrange ports on other modules and save the layout to be used by them but its very incomplete and messy at this point… it is all inside rack though.
For live reload I use a script that runs make and opens/closes rack on file changes. So it’s only as live as much it takes to build the plugin.
It’s interesting what you’re exploring here and I’m following this thread to see where the cython stuff goes.
In other news, Rack 3.0 might use another rendering lib.