Honestly, OTL was already a Rome-wank. When I started my TL, I planned to end it with an absurd border on the Vistula with total control of Arabia and outposts in Scandinavia, but since I have settled down and contented myself with simply controlling Germania in addition to OTL's territories. Something else I realized is that the "transport costs" assumes perfect conditions and only includes direct expenses. It probably does not account for indirect factors like supplying pack animals and people for their journey, the portoria (which was more substantial in some areas than others), and most importantly weather. Each of these would create greater barriers to transport both in cost and logistical terms. I think the circumstances that led to the assumption of the pharaonic mode of governing and rhetoric were highly particular and contingent on very deliberate administrative decisions made by Augustus and his subordinates. This was done to meet the demands of the new empire which had some 60 legions which would either need to be paid, given retirement bonuses, or both. It is less clear that if Rome establishes a presence in Mesopotamia, there will be the same impetus for deliberate and careful administration in accordance with extant local institutions.