I dont think there is an OOTB way to copy all the signoff team information on to the ItemRevision.
You may have to write a custom handler to copy on the item revision.
May be you can make use of Participants.
Teamcenter has predefined participants which are available on ItemRevision.
You can always create new participant types and use them for specific needs.
One or more members can be assigned to a participant in context of an ItemRevision.
You can set you signoff team in a workflow review task based on one or a combination of participants.
EPM-adhoc-signoff or EPM-fill-in-reviewers handers can be used to for setting the signoff team.
Participants members can also be displayed on the summary page of Item Revision.
This might not be exactly what you need. But you can see if this approach works out for you.