Is it possible to create an alternate invoice approval workflow based on a DFF

Summary:

Can a separate workflow be triggered for invoice approval based on the value in a DFF on the invoice?

Content (required):

Most invoices go thru a normal hierarchical approval. For specific types of invoices, identified by a DFF, we would like to execute a separate approval workflow as the approval limits are different for those types of invoices.

For example, a manager might be able to approve normal invoices up to $10,000, but for specific types (taxes, legal fees, etc.) they would have an approval limit of $1,000,000.

If executing a separate workflow will not work, does anyone know the best wat to set this up?