On premises Windows Server and Windows 10 joined to Azure AD DS [via VPN]?

Hi,

Sometimes, on premises Windows Server is necessary, which often requires AD DS.  Having on-premises AD DS is relatively complex.  

Windows Server can't join Azure AD (only via hybrid Azure AD join).

Is there a way round this?

1. Setup Azure AD.
2. Setup Azure AD DS.
3. Setup a Azure Windows Server VM that is joined to Azure AD DS.
4. Now make this Azure Windows Server VM a VPN server, (RRAS | Always On | SSTP)
5. Connect on premises Windows Server and Windows 10 to this VPN; from there, join to Azure AD DS.
6. Now, you have the benefits of on premises AD DS, but without needing an on premises domain controller

It would look like this;

Here's the same graphic, but showing the Internet and Internet router;

Is this possible? Anyone tried?