It was the Spirit Queen who first introduced the Orcs to Rock 'n' Roll and sparked a revolution! ?
Many things are possible. Good point about the EQP/BQP, and this is based on the NA base, but EU players surely can shrug those off a lot easier in their own continuity. Ignoring the Orc Bard would be pretty easy. How interwoven would he be with these new quests? Nobody says you have to play those either.. these are just in the bonus "unlocks" of the mythic tier.
I would treat this similar to the situation with Sir Ragnar. In my view, Ragnar is a hero. He would never betray the Empire. But if I were an Eu player, I would have grown up with the canonical fact that he was executed as a traitor (Spoiler alert!). I'm even over the "Mentor is actually Zargon" revelation that blew my mind this year. There are different continuities, and maybe in this one, there is the soul of a poet inside each Orc trying to get out, and this one green dreamer is leading the charge? But anybody who didn't buy those packs will have no clue unless you tell them. And they can always mod the parts they don't like away easily enough...
I've never read the novels (and judging by the prices they go for these days, it may be a long time, if ever, that I do). I take it as one person's interpretation even if it's officially liscensed. I never saw the sticker album's content until fairly recently. Before I started visiting the Inn (around '02) I had no idea much of the content differences outside North America even existed! What a joy to discover the Portuguese quests and the Japanese game system!
As the veteran survivor of many lately-added-to or rebooted franchises, I can sympathize with the changes not being to everyone's liking. But this is still fantasy, we won't have to play by their rules if we don't want to (that's part of the fun!). And who knows, maybe at the 40th anniversary we'll get something more to our liking out of the official channels?
I'm with those who would rather they had remade one of the classic quest packs instead of what we got with the unlocks, but there is a certain amount of anticipation of surprise that is enjoyable as well. For now we'll just have to mod our own Ogres and chaos Sorcerers and Elves to fit with the rest if we want to.
So for all I care, they could say that the Orcs are made of mushrooms and the Heroes are made of play-doh, that Mentor died in a shaving accident, that olde bretonnia was just a speck of dust on a blade of grass, and all the gold you found was fool's gold... and I don't have to accept it. If a friend asks me why I "like that silly franchise" I can always point out that nobody established those things for the first several odd decades in our territory and leave it at that!

So I do feel your pain, but the cure is easy. Just don't care about their missteps and ignore them. When push comes to shove, you "vote" with your wallet, and let the chips fall where they may. A politely worded letter to Hasbro/Avalon couldn't hurt though, they claimed they wanted to hear from us fans, and in some cases they have even listened (good on them).