Jony130:
Way back when, like in 1982, I wanted a unobtrusive "lights on Buzzer" of some sort. So, I said what might be simple?
I chose "Turn on buzzer when driver's door is open"
All I needed was a piezo buzzer and a diode. The driver's door contact was already isolated with a diode and went to ground when the dome light was on. So, I connected the +12 going to the parking lights to the driver's door switch through a diode.
Bingo: When driver's door is open, the buzzer sounds. Used the system for 17 years and had to replace the buzzer once. The car interior is harsh for a buzzer.
My current car has the: Lights go out when the door opens. Lights automatically turn on. You can, have the lights on and then stop, but not get out of the car and have your car die if you sit in the car too long. That is a rare event, so I just have to remember to open the door.
The "auto on" lights are tied to the emergency brake in both cars. The lights will not come on if the emergency brake is on.
The other car has a number of "modes" for the way the lights operate. Not all I like, but having them go off after 5 minutes after the door is opened is OK except when you want to scare away a deer that stopped in front of you.
I do recommend that you change the dome light to a LED based variety as well. The dome and the license plate light seem to be the bulbs that go first.