How about asking for military access. Can I use their airports and perform missions from there? Can I get air cover west of Portugal/Spain for my subs? Can I paradop on Gibraltar from neutral Portugal/Spain?
From my experience so far, Military Access only lets you move units through their land, you can't launch naval invasions from their ports or para drops from their airfields and you can't base fleets there either, so your fleet range remains limited to your owned ports.
Military Access is largely useless. If you want to use another country for any type of military advantage, they need to be your faction so you have full access to everything.