Mock library inside modules / Load module in specific environment

[king-of-poppk]

I see how the underlying implementation of box::use relies on calling box::use_one with parent.frame() and sys.call(). I am trying to mock library and require calls inside box-loaded modules in order to make them "work". However, all I've been able to do so far was to make library load all exported names available (modulo certain special exports, like ggplot2::mpg) in the caller module scope (similar to how box::use) works.

What's the proper way to leverage box::use_one to load modules in some specific module scope? All my attempts so far either resulted in C stack overflows (infinite recursion?) or modules being loaded in the wrong scope.