I've used Pulse Audio in Reaper for that same reason, but I just switch audio drivers in Reaper to Pulse Audio, accomplish the task, then switch back to ALSA. It's similar to how I'd switch from ASIO to WASAPI (shared) for that kind of task in Windows.
Plus in Linux, if I set Reaper to "close audio device when stopped and application is inactive", I can leave Reaper open to watch Youtube videos (etc.) and "toggle between" applications (as long as I hit pause or stop on the application's audio playback).
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