Why not getting a splicer, like you use for headphones?
2 male 1/4 inch one female, one foot switch.
Should work.

Eric
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Genos, PSR-S970, TC Helicon VoiceLive3, Mackie 802-VLZ3 Mixer, 2 Bose L1 Pro16, Electro-Voice ZXA1 Subwoofer