While you can't yet change which interfaces the GUI and SSH listens on, you could setup some floating rules to make this easier, something like
Pass quick TCP from <your management subnets> to This firewall (self) ports <alias with 443, 22, etc>
Reject quick TCP from any to This firewall (self) ports <alias with 443, 22, etc>
The "This firewall (self)" target expands internally in pf to any address on the firewall.