No, the SGL (with the special capability to finish Great Wonders) can only be received by the hardcoded event when leading in the techological race. BTW: What you suggested was a former setting for the Great University in an early version of CCM. My Great architect autoproduced by that GW could only finish buildings like a GL -no GWs. But may be my settings for that were not optimal. In CCM the SGL is an era-specific unit, but that is not new. Former mods managed this, too.