Sending Stock directly to Amazon FBA EU from another EU country

Hi We are a UK company and send stock to the EU for FBA on Pan EU basis. We buy stock from various countries in the EU and rather than having the stock sent to UK to us and for us to then prepare and send back to EU Fulfilment centres we are looking for a way to send the stock directly from whatever EU country it is directly to Amazon Fulfilment Centres. Problem is we need the stock checking, packing and labelling up prior to arrival at AMazon. I know that Amazon offer a labelling service but we need a middleman who will check and pack the stock and then send to Amazon for labelling and selling. Does anyone know of a solution?