Speedy way to update the custom properties template on multiple files?

Hi

I have set up a template for custom properties for parts. This has been working great. However we now need to change this. I have modified the template using the property tab builder. My problem is, when I open up a part on a project I am working on, I have to go to the 'template options' icon and reclick on the existing template foe it to update the properties to the new version. There are a few hundred parts and this will take forever.

Anyone have nay suggestions on how to do this? I though through the task scheduler, but this only allows you to change the data in the properties, not the template.

Thanks in advance, Jason.