How to mass update a field on suppliers setup?

Summary:

We need to flag a large volume of supplier to allow offset taxes, but seems only option is manual update?

Content (required):

We are investigating the functionality of offset taxes and self-assessment taxes in regards to handling reverse-charge transaction in Fusion cloud, of the two off-set taxes might be more appropriate however a significant huddle is the potentially very high volume of suppliers which need they profiles update to flag the 'Allow offset taxes' as true/yes.

There doesn't seem to be a way to do this other than manually updating suppliers via the 'Manage supplier' or 'Manage Party Tax Profile' forms. The default setup is no/false so everything setup to date has the flag switched off.