to use Service Pages the SP accounts do not need to be concurrent so you could update all the SP accounts to set concurrent to "make Empty". If anyone needs access to all the modules via servcie pages give them a regular account
You said that data exchange is importing these accounts that are showing as concurrent. Check the template for SP accounts as this is most likley setting the "Concurrent User" to yes on import.
Admin Console- Data - Template - SP_Accounts - Concurrent User