For ARS Sync Svc, using start-qcworkflow, is there a way to run without commit ?

I can get my ars sync workflows easily with the quest powershell commandlet get-qcworkflow, and get the properties/steps by ID
I can start the workflow using start-qcworkflow -id <number> - but don't see the option to execute without commit.

Ultimately, I have a new ars sync workflow that yields 9700 users to be modified, which can be previewed in the GUI.
my customer has asked for a copy of that data exported, so they can bless the changes for this first run -

if there is a way in the GUI to export the targeted objects to be updated, then that will suffice for this need.

if you know, share please.