[edmundofuentes]

Workaround I've been using for a while: You can install both the "regular" WhatsApp and the "Business" version, those are separate apps in the App Stores. This way you can set up your personal number on the regular WhatsApp and your work number on WhatsApp for Business.

[gcatalfamo]

Although valid, this is in fact a workaround not meant to be a stable solution, because it has the drawback of de-activating that number-whatsapp link on the first phone you used it on.

edit: I am stupid, as the latest feature actually allows this workaround to become a permanent solution...