Does the following make sense: sticking a Composer package (post composer install) inside of a Nuget package for deployment purposes. Or an NPM install result inside of a Nuget package?
In the context of deployment, would it not be best to deploy both types of packages?
The answer is... No, the scenarios do not make sense. If you want to wrap up different package managers into a single whole item, use containers. Nuget is not a container system.
If you don't want to wrap them up, figure out how to deploy for each package manager and build out an appropriate deployment script.