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Butterworth is a pretty common filter type, so why not just use one? The DDMF EQ from the Jan 2017 issue of Soundbytes would be a nice choice:

http://soundbytesmag.net/sb-plugins/

Or just Google “free butterworth equalizer plugin” for a flood of alternatives.

IIRC, ELI doesn’t bill the Arousor as a Distressor emulation, but an advancement. Also, there’s Sly-Fi’s Deflector that plays in this dynamics genre.