The system can handle a separate 35 watt ballast on the high beam circuit, but HIDS take about 5-10 seconds to warm up. They wouldn't be much use for daytime flashing and the constant on/off may be hard on the ballasts.
Looking at the Lits I have here, I would recommend installing solenoid activated bi-xenon cutoffs in place of the OEM fixed cutoff.
Most HID kits are CANBUS ready these days and cost around $30-50.
