iteration advancing without checkout / checkin

We are doing a poor man's migration with acquired WC data by Workspace exporting from the old data and Workspace importing to the current WC. There is a released pdf archive of this old data that will persist, showing Revisions and iterations for both drawings and models thru symbols at the drawings. We want to get the new-history iterations to match the pdf images. Some iterations were into the teens and are a pain to checkout-checkin to get to the new imports to match. What is a good way to quickly iterate these in WC without the many checkout / checkins?? Thanks in advance BW