Tried it last night....
... I thought the blue cheese flavor is quite prominent, and it's not a bad thing, actually
I used a Bleu d'Auvergne - it pretty much dissolved into the bread, no chunks of cheese, just its flavor all the way through.
the crunch of the hazelnuts is perfect.
Loved this bread, I am sure it will be a hit on Wednesday - I am not sure if I should slice and freeze it or just keep it at room temperature until then.... tough call.