Reverse Reverb in Reaper using ReaVerb / or other free plugins.

You could use any other convolution plugin, if you don't use Reaper. Have a look in your DAW for a stock Convolver plugin, or maybe use the free Convology XT if not. wavearts.com/p...
I reversed a reverb impulse by loading it into Reaper, reversing it, then rendering it out. Then, loading the rendered version into ReaVerb.
Easy peasy, and sounds good.
Experiment:
You could also try reversing the performance first, or reverse the performance with the reversed effect etc.