Hi,
If I am not wrong, you only want to start workflow from User exit only based on some condition. Then if you trigger CHANGED & CREATED events for BUS2032, then you feel other workflow may trigger.
If this is the case, then there have 2 option. 1st option is you have to call the workflow directly usin FM SAP_WAPI_START_WORKFLOW. You don't have fear that it will not visible from VA02/03 servces for object. If your workflow having any container element of BUS2032 and in workflow basic data General Task has been maintain, then from VA02/03 your workflow will be visible in Services for object.
2nd option is create a subtype of BUS2032 and create one custom event in subtype, and trigger that custom event to start your workflow, then no other workflow will trigger. That case also if you want to see the workflow overview in VA02/03, then your workflow must have container element of BUS2032 and in workflow basic data General Task has been maintain