You can code the side/parking-lights (aka city lights) to be on all the time - but even with retro fitted LEDS, by all accounts, they arent very bright.
Good suggestion though, probably the easiest option.
Legally, I can't see an issue with these provided you dont drive with just these on when it starts to get dark (it's yet another offense to drive with only side lights unless you are in a street-lit 30mph zone)