Add shipping carriers for users outside main account region

Hello i just had a chat with support and I was surprise to know that I cannot add carrier accounts from other countries when dealing with multiple fullfilment centers.

Example:
-I run a wix store with a canadian shipstation account linked to my wix store. I use shipstation to generate labels from canadian carriers like ups and postcanada.
-I want to add a new fullfilment center in germany to cater to EU customers so i create a new user and a new "ship from location" from germany. 
-To my surprise I cannot get and rates from UPS by shipstation or add a german DHL carrier because the main account is only allowed to use Canadian carriers. 
-Only work around offered was to have the German fullfilment user to create a new Shipstation account from Germany and link my Wix API code to that account. This causes a few issues where now the new German user has unlimited access to shipstation and my wix API key. Clients pay for shipping to my buisness account so i would need to add my payment information to the german user's account to pay labels from the same source. Both of which are concerning for so many reasons.