There's nothing wrong with the plugin. REAPER passes through the dry audio if a plugin announces itself as an instrument. The way to make this work in REAPER is to put it on a 4-channel track with pin routing as the OP describes. The question is whether there is something automatic REAPER could to do make this easier for the user. Probably the simplest thing is just a switch in the pin routing dropdown to disable the dry input passthrough -- functionally, this would override the plugin's self-description as an instrument for processing purposes.
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