Sonoff Mini R2 - Switch port connected to mains or neutral

Hi! I’m trying to run a 3-way circuit with a Mini R2. In order to do this, I’m required to run an extra wire from existing installation, as the far side switch middle port connects shared mains, and so I need a new wire there to connect it instead with S2. I saw that there are some other models as well as clones that allow the switch port to receive either mains or neutral and I’m wondering if anyone has ever tried such. Specially if S1 or S2 (which is the sensing one?) are GND it may work wi

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