Jim
DPPlus LNBFs will require a lot of power (over 500 mA) way more than the Max. LNB Supply Current: 400mA that the STARBOX will supply. So, a powered switch like the DishProPlus
DPP44 switch will be needed. But why go through all this expense and hassle for a couple of promo channels? Not worth it.
You may consider changing the DPP lnbf on your new dish to a DP lnbfs instead.