can AME be used to add a post approval group to approvers already determined by the approval groups/

We have the standard Purchase Requisition approvals defined using Approval Groups and a Position Hierarchy. Our requirement is to have an additional approver (based on a simple approval group SQL query) added to the end of the standard business manager approval but only in certain circumstances (based on type of PR and amount etc).

Can this be done in AME ? Do I have to re-create the whole Approval Groups / Position Hierarchy as a dynamic approval group with a complex SQL tree-walk query?