This is a lot like the 90 Canadian Passat. It also has a 3-position headlight switch. The parking light circuit 58 is ON when the switch is in the OFF position, so the parking lights and dash lights all come on with the ignition. It has a TFL pin like later DRL switches, but it is not connected to anything. You would have to replace the switch with one from a non-DRL Mk 2.
The daytime headlights are operated by a DRL relay that is located behind the headlight switch, bundled into the harness I believe. It is turned on by power directly from the load reduction relay, and that same power from terminal X is sent to the low beam headlights through a series resistance wire. The headlight switch is not involved at all. What puzzles me is that you say the headlights do not come on when you turn the key on, until after the engine is started. There may be a wiring difference there. To defeat the DRL on the headlights, you would have to locate and unplug the DRL relay.
Unplug the relay and get a non-DRL or a US headlight switch. The load reduction relay drops out the lights, radio, heater etc while the starter is operating. I just wonder if there's a problem with that relay or the ignition switch since the headlights are not coming on right away with the ignition. The Bentley schematic would hold the key to that. BTW the Passat's DRL wiring changed in mid-91 to delete the DRL relay and use the TFL pin on a 2-position switch.