VST 2.40 allow to send information from one plug-in to other blue cat meter do it. You can research about that and make a meta plugin that control Nebula parameter and works as mini host and latency compensated chainer. See melda productions meta parameters. Contact me if you need help but my time is so limited now!
Enrique Silveti. Acustica Audio customer and technical support.
I tried plugin merger and I see that it´s not a plugin, it´s a .exe for making a new .dll including some plugins. But it doesnt work with nebula, I can create a new dll but reaper crash when I try to load this new dll.
Anyway I'm awaiting for the brp's creation, maybe this will be the solution.