Two input connectors going to one switch signal loading

I'm working on device that will allow me to blend wet/dry microphone signal with a guitar effects pedal loop.

From the mic input, the signal will pass trough a preamp, then sent to a switch for bypass switching, then to an effects loop with wet/dry blend knob.

My main question is this: I am using a neutrik xlr/trs combo jack. I would like to be able to use the TRS jack as a guitar input that goes to the blend circuit while bypassing the mic pre. Essentially if a 1/4" trs jack is plugged in, the signal will be sent straight to the bypass switch, if an xlr is plugged in, the signal goes through the pre. Will connecting the TRS directly to the output of mic pre impact the TRS signal?

I attached a schematic to illustrate better what I'm planning to hook things up.
 

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    schematic example.jpg
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