Need a report to audit workflow step processing and delta changes

Our business has a requirement that needs audit entries with the workflow:

The requirements are as follows:
* We need to identify the item and its delta changes within the workflow
* We need to identify the time it started and ended in the workflow step
* We need to identify which user and role created the delta changes of the collaboration entry in the workflow
* We need to make the output human readable and allow the audit statistics be sent to a downstream system

IBM support offered us the following SQL that can assist, however through the database tables we cannot determine the delta changes of the collaboration area entry:

SELECT itm_primary_key,
spt_leaf_step_text_path AS source_wfl_step,
coa_name,
wfe_start_time,
wfe_finish_time,
wfe_event_type,
wfe_event_status,
scu_username
FROM wfe,
scu,
coa,
spt,
itm,
wee
WHERE scu_user_id = wfe_user_id
AND wfe_collaboration_area_id = coa_id
AND spt_id = wfe_source_step_at_path_id
AND itm_id = wee_entry_id
AND itm_next_version_id = 999999999
AND wee_event_id = wfe_id
ORDER BY itm_primary_key,
wfe_start_time,
scu_username

The history tab on the UI with the collaboration area entry can only be accessed individually. We need a report that can create such audit through all the items

The searchHistory() and searchFullHistoryForEntry() APIs provides the delta changes in XML format, but does not give us human readable string output to determine what workflow step, user, object, etc. Many of the objects in the XML are identified by object ids

Either we would like an enhancement to the searchHistory() and searchFullHistoryForEntry() that can meet these requirements in human readable format or have a report that can perform this requirement