Transpose certain keyrange

I am looking for a way to transpose just a certain keyrange on a midi track. In reaper, you can define the keyrange in the stock plugin- in logic I haven’t found it yet.

I use it for an amplesound Guitar plugin where a certain keyrange defines the play style and therefore should not be transposed. I don’t like to transpose in the plugin itself because I‘d like the displayed chords to be simple (were playing tuned down a half tone)

Any hints?

Thanks in advance