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The details shown in our cad are only for anchorage to our tarmac and do not represent what would be used in a bridge deck.

I have copied Scott on this. He did the development work on the buttress and may be able to guide you on the tie into a bridge deck. It would likely depend on the deck in question, but is mostly a question of achieving appropriate development of the anchor bars.

You are correct.  The 6” embedment by itself is not sufficient to fully develop the stirrups.  The simplest thing to do would be to put a 90 degree bend in the front leg of the stirrup and tie it into the lower mat of steel in your concrete slab.  Unfortunately, we don’t have anything sketched up showing these bars fully anchored to a slab right now.