Option a is not working for some reason, I can suggest option be. EDIT: it is working but generates multiple workflows. So a workflow to get approval to remove 300 files it is generating 300 workflows and payloads. Not optimal.

How can I add multiple assets to some workflow's payload? Pages does /mnt/override/libs/wcm/core/content/common/startbulkworkflows.html but I override asstes.html to do same and it is not working Thanks