There is a command to remove an account template directly from the AD Account.
Release : 14.2, 14.3, 14.4
Component :
etautil -u USER -p PWD update 'eTADSOrgUnitName=MyOU,eTADSDirectoryName=MyEndpoint,eTNamespaceName=ActiveDirectory' eTADSAccount eTADSAccountName='MyAccount' to -eTPolicyDN='eTADSPolicyName=MyTemplate,eTADSPolicyContainerName=Active Directory Policies,eTNamespaceName=CommonObjects,dc=im'