I came to Alaska right at 500 hours and had zero problems! It's all the experienced guys that kill themselves here. They get cocky and complacent and don't stay inside their limits. The last 5 deaths this year have been guys with thousands of hours up here. If anything come up here at 500 and be smart and stay within your limits and you will be fine and will learn a ton. Good stick and rudder skills and common sense are your friend up here. Not everyone is cut out for flying in Alaska but you'll figure that out day one. So hit 500 hours and come up and give it a shot. Best decision in my opinion! Build hours fast for good money and build a great resume.
Good Luck!