Hello there,
EC might work well for your condition.
An External Connector license is an additional license assigned to a server that permits access to that specific server. One example is the Windows Server External Connector license. This license is required if any external users will access or consume any services provided by a particular Windows Server.
A CAL is not a software product; rather, it is a license that gives a user the right to access the services of the server.
Likewise, if you manage the devices on your network by using management software such as Microsoft System Center, a Management License (ML) may be required for the device being managed.
Hope this resolves your Query !!
--If the reply is helpful, please Upvote and Accept it as an answer–