Hey
Never too late to answer ,
"I know you can setup an allow list for the whole Attachment/File filter but I can't find a way to do that for the individual file type/extension"
There is no way to create a Whitelist with FPE/FPSP Client .
"want to be able to create an allow list and let 10 people from the organization to send and receive zip files but I want forefront to still block all the other blocked attachment file types/extensions for those 10 people."
The answer is above , and you can't create allow list also for specific people from your ORG or any one .
FYI
I'd be glad to answer any question