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I don't know if this is a workaround or if this is actually the way to do it.
The Sampler1 routing matrix was changed to like the image from post 1, except without the blue lines indicating sends.
I created a Send Container (to people who don't know, this works as a receive for any audio you send to it. That took me a little while to understand).
Then I added 5 send effects to my sampler, sent them all to Send Container1 (set to channel 0 inside each effect), changed each send effect channel routing to cover all 5 stereo pairs, and set their gains to 0dB.
The send container goes out plugin channels 1+2, and the remaining outputs have the individual drum mics routed to them from the Sampler1 routing matrix.