I only use ALSA (I don't use JACK) and I let Reaper disable Pulse Audio while the Reaper window is in focus. I also don't use anything which involves bridging. Sorry but I won't be able to do tests such as yours on my system.
When I started using Linux I decided to keep the system as foolproof as possible. I don't want to get bogged down with compatibility of various things (WINE, JACK, bridging), and in Windows I never did anything like that anyway.
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