Remotely correct VPN and Router Subnet Mismatch

Question

I have recently changed the subnet on my router from 192.168.1 to 192.168.40 but forgot to change the range of VPN addresses on my server to match. I can connect to the VPN but cannot access anything on my network due to being assigned an address 192.168.1.10x. I am able to view my website via 192.168.1.100 but cannot RDP via that address.

Is there any way I can RDP and correct this remotely or am I out of luck until I get back to the office?

Using Windows Server 2016 Essentials, Windows 7 on client.