One tip,
Change the snmp community for the ams servers, use that community for the other tool and don't tell SIM this new community or better allow only the other tool access to the windows SNMP. Default community SIM uses is Public so if you don't use that SIM can't login. These settings can be replicated to the AMS servers using the replicate funtion in SIM. Also remove the server first from SIM and readd then again.