I will take a look at what the original 5 wires were and think of something when I have some time. It's very possible this is doable with just 3. We need to figure what those 3 are, and which to connect to the low beam wire (yellow) and disconnect from the splice.
1998 BMW 328is - summer
1994 BMW 325i - daily
1992 BMW 325i - gone
1988 Mercedes Benz 190E 2.3-8V - sold