Blend Angry Charles and Wrecktifier

A friend requested essentially a Blink 182 pedal - a Marshall in a box and Mesa in a box with a blend knob to blend the two. I've built both of these individually a few times and figured they should do the job, am I good to just split the input to both effect inputs and then send the outputs to lugs 1/3 of a pot with the wiper going to the output jack? Not sure if they'll be in phase or if I'll need additional buffering. I have plenty of pots so I can test values for the nicest taper. Thanks for any input!
 
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