Wow, now I am confused!
Bill, I gotta think your overthinking this. Surprise!
I don't know where this duplicating tracks and stuff came from, but assuming I am not misunderstanding the intent- its just not that complicated.
Common practice is to either use a reverb with filters built in, or place them before the reverb. For me, always on a send bus.
I always start a mix from my template, which contains two reverb sends already set up. One short reverb (room) and one long reverb (plate). Each of them has an EQ before it where I nearly always use a HPF to kill low frequencies going into the verb and nearly as often, a LPF to reduce the high frequency content going into the verb. As a result, you get a cleaner, less muddy and less "hissy" or "washy" verb that you simply blend back in to the mix.
harder to describe than it is to set up and use.
I reckon I need to whup up a new tutorial, as there has been many related questions here lately.......