LED bulbs could fit the bill for the fog lights. You can do HID, but it really starts to mess the LCM and cluster in our cars after awhile. It still affects it even when you run a wiring harness. You would need to have a complete separate switch not tied to the LCM to be safe imo.
the v4s are closer to like 6500k imo. so even the osrams bulbs will be whiter.
I'd just leave the high beams alone. Unless you're actually using them.