GA4 Outputs & Reaper Inputs -- Making them Play Nice

Let me describe my dream scenario – Drop Groove Agent 4 into Reaper, let it output its 16 tracks, but have 16 mono outputs to 16 individual tracks rather than 32 out to 16 stereo tracks.

Then, in GA4, assign the kick to Track 1 in Reaper, on down the line through 16.

I’m looking out GA4 outputs, which are Master, Out 2, etc., Reaper’s plug-in routing AND individual track routing, but it just isn’t working. EVERYTHING goes to buses and kit buses through the Master, then chaos ensues.

Can anyone help get me going or at least explain why this will never work?