Yes. Pick the Reward level you want which included DVD, and when you get to next page on Kickstarter, add $5 to amount but keep Reward the same, and I will make note to change your DVD to blu-ray. Thanks!
Any questions about this must be made directly at "Contact Me", and is outside Kickstarter, and not part of campaign, but certainly if this is an area where you have credentials, it's part of the film business and you are free to contact me above.
Don't see the answer to your question? Ask the project creator directly.