World latency issues due to grouping with USA

I play on Khaz’goroth which is an Oceanic server and when ever I am forced into an American server my world latency goes to 500+
I know Blizzard put it in place to counter queue times but I would much rather wait over an our for a dungeon then get one in 7 minutes but constantly have to wait several seconds to cast a spell. It makes mythic dungeons unable to participate in due to latency and having to dodge an attack a few seconds before it happens.
Please allow an option to choose if you want to go into other countries servers because right now I either have to no do mythics or find a tank that can solo them so it doesnt matter if I die, or pay a group to carry which is tens of thousands of gold that I dont want to spend.