The powers that be need to balance the volume of largely innocent domestically based away fans who fancy a day out in Birmingham against the pro-Palestinian supporters who'll want to make their voices heard. On a much smaller scale there are regular protests that provide inconvenience at Israeli-owned military drone manufacturer Ebit Systems in Shenstone, plus on an even smaller scale 4 broke into Moog in Wolverhampton last weekend, so potential is there.
All tickets must be sold to registered members. WMP can invoke section powers a mile or so around the ground to prevent protest & any subsequent congestion, plus have to manage where Maccabi stay as that could well be a target.
To play behind closed doors is a cheap way out, but I can see it happening just to avoid the smallest powder keg.