Yeah, looking at the close-ups, it does look like those orange pads are hard material so siping may not be very effective. Sure, those fat spikes should work but I would be concerned about the damage they could do to wooden stairs or walkways. The OP may have already considered that and maybe it’s no big deal. FWIW, if it was my problem and I was compelled to ride on rainy or wet days, I’d just adjust my route to avoid the need to carry my bike over stairs but maybe that’s unavoidable. Or, get some cheapie foul weather shoes better suited for wet conditions and save the Sidi’s for bluebird days or tap dancing. Seriously, good luck and be well.