The field 'Dropship Address' gets printed on the PO as 'Shipping Address' and it is selectable from a drop down list prior to confirming an RFQ

As default this field is only visible when the 'Deliver To' is set as dropship or dropship subcontractor.

It is possible to 1. Use studio to change the condition of this field to be always visible on an RFQ to select. 2. Set the freight forwarder address as a default on this field (it will be always set irrespective of it being visible on the PO.

Apart from the fact this address is printed on the PO, I believe you might still require to configure routes or adjust your routes to track receipt at Forwarder location and your WH location.

Would not use a warehouse unless you require to maintain stock at the forwarder.   Lot of extra work.

Normal procedure in such a flow is to have your warehouse as the delivery location on the pruchase order and specify with Incoterms where to deliver. DAP (Delivery at place) would cover what you need.   Incoterms like DAP, CIF, CPT should all be specified with the place to deliver as additonal information.

Your forwarder would also need to know the final address.  Also if shipment is crossing country borders, the documents must show final delivery address.

You would need to enter the address of you forwarder as additional information.  There are some options in Odoo to make this entry more efficient.  But would require some development or changes with Studio app and perhaps some automatic actions.