Here is what I do for stuff like that. Use a multiband gate.
There may even be a reaper plugin (came from another DAW and had a whole collection of plugins i was used to so i dont know the reaplugs well)
I use Melda multiband dynamics works.
Just set a band that covers 300 Hz (and 300 sounds pretty high, thats above middle c, how high is your part realy?) and below and set the threshhold so it cuts out the extraneous stuff u don't want. When the piano drops down low, the gate will open. I usually set a pretty long hold and release for it to sound right.
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