you can use reatunes midi note out on pitch change facility, followed by a midi note to cc (or pitchbend etc.) converter (e.g piz midi's converter 3) followed by your eq.
so you have pitch > midi cc.
then can learn/assign that signal to EQ freq/fundamental param.
can tweak the conversion to hit the right values - the only fiddly bit as i see it.
just had a quick try - should work.
or get something expensive.