Drop Shipping items from a KIT or BOM

Dear Community,

We are struggling trying to find a way to drop ship items from inside a BOM or KIT.  We have two situations at the moment, we drop ship at time of order to the customer and drop ship at time of shipment to the customer.  Our marketing group wants the customer to be able to order 1 part and it will include items from our warehouse and that will be drop shipped from a 3rd party.  Has anyone found a way to efficiently do this?  We have quite a few items we cannot hold at our site due to regulations and need them to ship directly from the vendor to the customer. 

Thanks,
Seth