I love the idea, and I'm doing something similar in Ruby (which, yes, means it will be far less universal than a compiled library; that's an intentional tradeoff - I don't need it to be universal, and even less so when someone is willing to invest far more effort into something that is universal) inspired by AmigaOS, where a terminal window was easily accessible to any application whether it was started from the terminal or not, by opening a file handle to "CON:" (which meant e.g. scripts could also pipe this directly into a newly opened terminal window).

It's one of a few "lost capabilities" of AmigaOS I'm glad to see getting addressed. You can of course fix this today by using one of a variety of terminal widgets, but the ease of being able to just spin up a full terminal window from "anywhere" was very powerful for simple utilities etc.