You can look among Misc command actions - and there is one to pass through key to main window.
So assign the keyboard shortcuts for each action that you want to send to main screen and it is picked up there.
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-- Windows 11 Pro, i7-12700F 2.1GHz 32G, RME Digiface USB Audient ASP800 Lexicon MX200, Reaper 4.78 --
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