If I understand what you're saying, for example, you move all your P5 G&T to some generic G&T runtime. Then you remove your P5 runtime, so you the library GUI doesn't have to read it. But you have content in some saved scene that references stuff that was in P5, and now is in your generic G&T.  Your question is will it find it?

I believe it will, but I've never done that sort of thing, so can't say for sure.

Why not just try it? Load some stuff from P5 runtime, save the scene, unload the P5 runtime, move G&T stuff from there to some new TestG&T runtime. Add TestG&T, then try to load the scene. I'd try it myself, but that's no guarantee it would work for you, plus I'm really tired and going to sleep now.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)