Yup, you'd need to build a whole separate Internet uplink. Create the SSID (eg. ITDev), use VLAN trunking to put it on its own VLAN, with its own default gateway and DHCP server - could be a separate MX unit, or just a regular router. Your SSID would need to be in bridged mode so the router/MX can assign a different subnet and different default gateway to devices on the ITDev SSID.
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