I grow my blueberries and huckleberries together on the same hugel, and it works really well. They both like the same acidic ph, and the strawberries work as a great ground-cover under the blueberries. I grow wood strawberries in mine, and they do fantastic. I would assume that domesticated strawberries would do well, too. They might not be
asproductive as if they were grown alone, bu they will still produce, and you wouldn't have to build an extra garden bed.
As for lowering the PH, I didn't really need to lower mine, as we have a low ph already. But, using conifer wood as the wood inside the hugel should help, so will adding lots of needles as mulch. I've never used a soil test, so I can't really speak to which ones to use...
Attached is a picture of my strawberry/blueberry hugel. It's the one on the left. I'm also growing a rhubarb in it

. If you put a rhubarb in yours, make sure there's a bit of distance between it and your blueberries, as I think it's roots messed with one of my blueberries. I'm not certain about that, though...