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This is how I handled it:
Main container. Inside:
Sampler
Send container
Sampler FX:
A series of send effects.
Each one selects a channel pair (0 being 1+2, 2 being 3+4, etc)
Sampler routing matrix:
For the outputs that I need to duplicate.... route the left through to the container inputs.
Leave an empty socket for the right.
Any top row sources that are genuinely stereo just route through as normal.
Send Container routing matrix:
Connect the top row channels to the 'empty sockets' for the right source.
This means that 1+2 now carry the same signal. 3+4 carry the same signal.
Main container:
Now you can add Simple Gain insert effects and assign them to the pairs.
This gives you a volume control for the dual-mono pairs, as well as the regular "true stereo" sources.