1 cent:
I don“t know if it's possible with Windows VPN but if you really want to work as if being in the office environment, a bridged (not routed) VPN is the only thing that gives you that feeling. This way even network broadcasts reach every node and your (VPN) ip interface gets some address from within the office. OpenVPN can be configured like this and no routing/forwarding is needed and really everything works like being part of the office local subnet.
Another cent:
Because of the mentioned requirements for bandwidth and access to assets, the only option for me personally is to just RemoteDesktop into the office via VPN and work there on a workstation. Windows RDT has greatly improved with Win10 so I even don't see any reason to use any other remote desktop application.
Total: 2 cents :)
Good Luck
Im trying anydesk tonight to remote in and see how that works. Ill look into bridged VPNs. Im sure we have the capability with our server and firewall.