OrechDin – you mention poskim in Israel who require masks. So, if a Rav of a shul follows that psak and someone shows up without a mask or in a half-mask – what happens? Do they get an aliya? Or do we now have separate shuls with and without masks?
Maybe we could use a 2×2 mehitza with traditional men/women separation in one dimension and mask/non-mask dimension in another. I saw this happening spontaneously sans the mehitza.