like he said there is no place to break the drl. because the light sensor goes to the light control module and it controls weather drls or headlights are required but use the same wires. the light sensor wouldnt be easy to interface. the easiest thing i can think of is a double throw relay operated by a switch inside so you can switch the lcm output from the headlights to leds or what ever you want. even that would likley set off alarms on your DIC. your best bet would just be add a relay to the headlight circuit to control the leds and have them both be on.
1998 Bonneville SSE
2007 Monte Carlo LT-KYB, Clarion, Polk audio, Kicker
1999 Yukon SLE-KYB, Air lift, Reese dual-cam, Tekonsha
1987 Firebird-355/th400-nothing stock