I am thinking more along the lines of Swift libraries I have found programming back and forth between Objective C / Swift / Java a bit easy (besides some nuances, it's mainly syntax sugar). But I can see how it can be difficult for those (not you), who works mainly with basic languages. <-- I did that long ago.
Now..... The big question is: Will you merge all of your IDEs into one? It would be really interesting.
Another question: Could you change the interface type to MDI? I'm not sure if you know how to do it with tabs, but here's a link anyway. (I've never seen an app that has an MDI interface in tabs.)