A better solution is to create your own Master Buss - ie Track 1, and route all your tracks/busses there. Put your master FX on that track and send that tracks output to the Reaper Master which then goes out to your hardware.
2 things then happen … a) easy to do your midi in stuff to the track as per normal, and b) you will probably see an increase in overall performance as the new master is treated like an ordinary track and will not compete for time on the audio thread and can offload stuff to the cores, rather than running the whole master FX chain on one core.
HTH
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