A relay harness fixes the DRL HID flicker issue present in 07+ Delta cars. I believe it's due to a low voltage being pushed when the DRL is on, I haven't measured it myself though.
The real problem is that off the shelf projector headlamps that I've seen are designed for halogen bulbs so you'll still be directing light everywhere of you put HIDs in them.
But on to the high beams as DRL issue. To accomplish this two options come to mind:
Either have a voltage sensing circuit that will shunt to the high beams when the lower voltage DRL comes on.
Or have a series of relays setup such that if the low beams are on and the parking lights are off it shunts power to high beams. If parking lights are on then it behaves normally. Flashing people might be an issue.
The final part, lows on with highs is easy. 2 diodes and a small capacitor does the job perfectly without the lows flicking off when making the switch.