Yeah, I understand. I thought what you did to them already converted them over to RHD. I'm not following 100% here as to what you need to swap over, post some pics? I think it's a lot of trouble to go through that much effort of replacing the internal light reflectors and adding more stuff, don't you?
HID's require a ballast and can provide better lighting output. Depends on the kit you get. I have HID's and it's plug and play. I just needed to mount the ballast somewhere. In my fluted glass lens they work alright and provide much brighter light than the stock H4 bulbs ever did, but they still don't project the light as clear as newer style lights. IMO Projector style lens are the way to go for lighting.