What are the alternatives to XMLHTTP when sending data from Windows clients to a server using WSH?

Question

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The task is to execute on a group of workstations (Win7, WinXP SP3) a WSH (JScript) script that would perform the necessary actions and send data to a given server.
At the moment my script:
- collects the necessary data;
- converts the result to JSON;
- via ActiveX XMLHTTP (one of 3 possible editions is selected), a POST request is sent to the server with the specified data string;
- a simple PHP script hangs on the server, which logs everything that is sent to it.
Can you suggest an alternative to this method? Conditions:
- it is important to use only the built-in features of Windows (7 and XP XP3);
- the solution on the client side must work from under NT AUTHORITY\system;
- provide for receiving data from 1000-2000 clients per minute on the server (the amount of data is small - up to 100 KB per client);
- the information collected and stored on the server should not be available to everyone;
- if there is encryption / compression, then this is only a "plus".
Interested in the "scripted" option. Solutions like custom plugins for ocs-inventory, zabbix-agents are not considered yet.