through HP SIM directly no as i know
What type of enviroment you have - blades or rack servers ?
If blades you can run something like this on OA level
$result = &C:\plink.exe -ssh -l $user -pw $pass $x "HPONCFG all http://httpserver/iloconfig/Get_SSO_Settings.xml"
$result | Select-String "RIBCL results", "MESSAGE","TRUST_MODE VALUE","SSO_SERVER INDEX"
If rack servers
Something like this
&cmd /c "C:\Program Files\HP\hponcfg\hponcfg.exe" /f iLO-AddHPSIMTrust.xml