BS”D
Yes, just wear a 2nd yarmulke or even a napkin under your yarmulke better than missing a minyan because you have no hat. And if the minyan doesn’t accept that chas vesholom and does not count you (as opposed to not letting you have the amud but if you need the amud just about anyone would lend you their hat in a normal Chassidish or yeshivish minyan) then why would you want to daven in the Sdoimer Shtibl anyway?