How I believe the Durkula awareness reveal will go.

[Snails]

I believe that the Order will realize that it's not Durkon when HPoH will bring death & destruction to the dwarven lands.

I feel that such is likely. HPoH and Hel seem to have somewhat concrete secret plans where some degree of haste in the near term is desirable. At some point, the Order is no longer a significant asset, while they are still strong enough to get lucky and win a direct confrontation. The HPoH has a half-baked excuse in hand: "You all save the world, because I urgently need to help my homeland with ___________". The HPoH, being not particularly people savvy, could easily misplay that.