Woocommerce wholesale prices – allow vendors to add wholesale customers

I am using “Woocommerce wholesale prices” plugin. Now vendors can assign wholesale prices for products. But they can not add wholesale customers for their store.
How to allow vendors to add wholesale customers? Because admin can not add wholesale customers one by one for all the vendors. So vendors themselves should be able to do that.
My suggestion is that:
If “Woocommerce wholesale prices” plugin is integrated with WCFM and when vendor is adding new customer,
their should a checkbox like “Mark as wholesale customer”.
When vendor checks this checkbox, an additional role of “Wholesale Customer” should be applied to that customer by keeping primary role “Customer” unchanged.
This way we can make sure, in case “Woocommerce wholesale prices” plugin is disabled/deleted that customer will have access as a normal customer.