Spent an afternoon on this a couple of summers ago. I removed the DRL resistor all together and wired up a relay instead. I also wired the relay to one of the parking light leads. The U bars light up as DRLs and as parking lights. Had to run a separate power lead to the UBars and the relay controls the ground wire. Has been working for a few years but is not so pretty under the bumper
Unfortunately no wiring diagrams to share but maybe that will get you going...