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It makes perfect sense.
What you want to do sounds like custom wiring. That's not how Candian DTRL works, and you won't find a schematic like that anywhere.
It's doable. You need 2 relays and 1 switch. Generally, you use 1 relay to provide ignition key-on power. You use the other relay in series with the first relay to give power when the headlights are on. The switch you wire in parallel with the 2nd relay to supply power on demand.
The problem will be current collision when both the relay and the switch are on.
I recommend using 3 relays and 1 switch, and use 1 relay to send power to the lights. You use the other 2 relays and switch to provide ground to the first relay. This way, if anything shows ground, the 1st relay will trip and power the light. You don't have to worry about current collision when you build negative-triggered system because exposing a wire to 2 grounds is no problem.
Read up a little bit and think it through. If you still have questions I'll do a schematic for you. It's actually quite simple if you think about it.
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