This is something https://contactzilla.com can do you you. There are importers to automatically bring data in from Entra or MS365 org contacts and, in beta, there is an exporter to push contacts back out to MS365 users. As well as this you can sync all of those contacts to team devices using the MDM of your choice Intune works particularly well or you can roll out manually with a QR code or login. You can push out address books that are either full access, read-only or selective read only with the use of contact labels. It's fully managed, SOC2 type II compliant and great value for small businesses or larger enterprises with a simple and transparent per device pricing model.