You can automate the presets of any FX using an envelope, but it's not totally straightforward.
On the FX, next to the preset dropdown, click the + sign and enable "link to MIDI program change => channel 1".
Insert ReaControlMIDI upstream of the FX. Enable Bank/Program Select. Click Param => FX parameter list => Show track envelope => Program. This will make a track envelope appear, which is tied to the Program dropdown on ReaControlMIDI.
Add/edit points to the envelope and you should see the FX preset change.
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