K1V is a good solid choice for a wide variety of applications and was one that I was going to suggest, but you don't have to worry about wild yeasts when you're using it. It's got a kill factor so it triumphs over competing yeasts. It's also got a pretty high alcohol tolerance so it depends on how dry you want this mead to be.
And just a note, cooking any fruits runs the risk of giving them a cooked taste and also setting any pectin that may be present in the fruit. If you're worried about other organisms, I'd suggest adding a crushed campden tablet 24 hours before pitching. I sometimes steam crabapples and pears to make them easier to mash, but I don't find they get a cooked taste because they're in larger pieces, but I can see it being pretty easy to overcook blueberries if you're not careful.
Back to yeasts...
RC-212 is also a good choice for dark berry/red wine if you can pamper it adequately, I've used it quite successfully in a few applications but you just have to give it lots of nutrients and energizer or it kicks up a stink... literally.
71B is great if you can remember to rack it off the lees.
D47 is great if you can keep the temperature under about 70F, otherwise it makes stink...
EC-1118 is a good solid performer you can safely ignore, but some people find it blows all the delicate aromas and flavours right out the airlock during its extremely vigorous fermentation, and as Khan said, it'll take most things pretty dry.
Even bread yeast makes a pretty good mead as long as you make sure it's sweet enough and properly balanced with some tannin/bitterness and some acidity, I've found the basic recipe for Joe's Ancient Orange works for a lot of things, I just haven't tried it with blueberries yet. Bread yeast and 3.5 lb honey per gallon, starting gravity usually works out to around 1.125 and usually finishes around 1.025 for me.
I will defer to how much blueberry to add as I haven't done a blueberry mead myself, but I'd suggest doing an advanced forum search with blueberry as the search term started by user THawk and reading through his brewlogs, maybe ask him some questions about how strongly the blueberry flavour comes through; he's been using blueberry a lot lately. When I do get around to trying a blueberry JAO, I'll be looking at his logs myself.