No, the UNS doesn’t set the NAV1 course. It doesn’t IRL either, it’s just not wired this way with this avionics suite.
not sure what you mean by “dial it using HDG” — you’d match the heading but with your current heading, then switch the AP mode to HDG. Then change navigation sources to NAV1, set the ILS/LOC front course using the CRS1 knob, then follow ATC instructions u til you can arm NAV or APPR on the autopilot.