Hi Krishna,
I suppose AC Validation – Risk Analysis only" should suffice your requirement from IDM side.
IDM prepares risk analysis request, submits the request to GRC and process the output of risk analysis.
Rest to be config'd in SAP GRC side. GRC should receive the request from IDM, performs risk analysis and creates request for remediation and send out of request to IDM. Did you check with your SAP GRC Consultant if workflows and WS are correctly configured in GRC side?
Kind regards,
Jai