Bulk update flowbuilder responses to business hours during holidays

Hello,

As we approach the holidays it would be beneficial to have a way to bulk update all flowbuilder responses once it hits the business hours conditions to include holiday OOO messages. Going through each flowbuilder one by one before and after a holiday is extremely tedious and time consuming. 

Has anyone else found an easy way to still use flowbuilders to mitigate self serve answerable questions but then advise of holiday OOO once they get to the point of being xfrd to an agent?