Here’s the Reaper Blog video doing it on one track.
https://reaperblog.net/2018/05/filtered-delay/
Those gmem plugs can be a little weird to get your head around, but allow a lot of crazy crap. In either case, do be careful. I hate automute. Just put a good actual hard limit after the delay. Whether that’s a clipper or saturator or whatever. I’d use ReaComp probably, but it absolutely must be a sample-for-sample hard limit.
I personally think that if 0dbFS square waves (the loudest thing your interface can pass no matter how loud reaper tries to make it) harm your speakers, then they’re either calibrated wrong or just not powerful enough. Likewise, it shouldn’t damage your hearing in the time it takes to figure out how to turn it down unless you’re monitoring way TF too loud anyway. It could kind of ruin your day, though...