First I would concentrate on the UNMODELEDDATA on the workstation side, if not it will be readded if not filtered:
- Clean out the items in ldappl and make available to clients.
- If you are storing custom data in the HKLM\Software\Intel\Landesk\Inventory\Custom Fields keys I would script something to remove them.
In 9.0 you can use the unknown inventory items http://community.landesk.com/support/docs/DOC-7456 and then use DBrepair to remove the information http://community.landesk.com/support/docs/DOC-2297
Works beautifully, thanks!