You can leverage product filters to restrict the sale of certain items to customers. This can be configured per customer group or per customer and it leverages the item groups plus the 10 filter codes that can be assigned to items.
They’ll possibly need to determine a way to group the items restricted for sale together, because the form isn’t configured to make a per item/customer rule set.
Here is an example (Pic1):
If the customer or customer group was configured like above, they would only be permitted to purchase items in the Audio item group.
Should they place an order for item that is not in the item group, they would receive this error message (pic2):