Alright. You’ll need to do some manual setup of a set of Bidule mappings:
On the project start page, devices panel, right-click the Bidule mapping and select “new copy”. In the properties dialog that appear:
Name the mapping e.g. “Bidule 1-2”, select the “link to global instance” option, select “stereo” in the plugin input and output combo boxes. Click ok.
Now right-click the new mapping you just created, select “new copy” and:
Name the mapping “Bidule 3-4”, increase the two “first channel” settings to 3. Click ok.
Repeat for as many stereo pairs you need.
Once you have set up the mappings, you can assign them on separate tracks to treat them as individual stereo effects.