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An interesting replacement for a relay is the buffer from tube stuff, since I tend to avoid relays.
If you attach a transposer, filter or sorting machine, it will send a redstone pulse to all attached rp2 machines.
A router can insert into a specific slot number. 3 routers should do the job. 2 for inserting, 1 for extracting?
You can attach an interface directly to the fabricator and pull from the bottom (haven't tested other sides) with an import bus.