They “simply” could put in back the whole VSTi/VST support of Renoise, since Redux exactly is Renoise’s instrument editor. Then all would make much more sense (at least to me 
). I think they only are afraid of support issues which might arise (due problems ins third party plugins, which is pretty good point). So they could add VST with some “hidden” config switch, saying that it is not officially supported and not advertised either.
Oh wait, currently no VSTi support within instrument layer (it is outside instrument layer in Renoise). So this idea would go hand in hand with my feature request here: