Bulk update to add custom form to tasks when some tasks already have the custom form associated.

I have a custom form I need on all tasks within a project (project has 500+ tasks). When I select all tasks and do a bulk edit, the custom form does not show up b/c it is not on all tasks. It is also not in the drop down list of custom forms to add b/c it is already on one or more of the tasks selected for the buik edit. The custom form may be missing from one task or it may be missing from 499 of 500 tasks. The only way I can find to determine where the custom form is missing is to edit each task one at a time and manually verify which is not realistic, especially since the next time someone adds a task without the custom form, I must start all over again. I am not able to find any options to report on custom forms attached to a tasks. Any ideas how I can systematically either: 1) Bulk add a custom form to a group of tasks, even if some of the tasks already have the custom form or 2) determine which tasks use a given custom form from a report/list of tasks or 3) determine which custom forms each task has associated with it from a report/list of tasks Thank you!