I agree (depending on the type of VPN you have to work with) that you should look for a site-to-site solution. However, rather than trying to unlock a feature that may exist in your router, it may be easier to set up a port-forwarding rule on the router/FW to pass the ports the VPN runs over to an internal VPN "client" on the DMZ or LAN interface that then shares the connection with the rest
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"RSA" - OpenVPN configuration files. Work with almost all versions OpenVPN clients, including ancient versions. Maximum compatibility. 4096 bit RSA encryption keys. AES256 symmetric encryption. Hash Functions: SHA384 / SHA512. MultiVPN - universal VPN with elliptic cryptography (Perfect forward secrecy) Each your connection to our VPN server is encrypted with a unique session encryption key, which is destoyed after the disconnect; Reliable algorithms are used to encrypt your data: key exchange RSA 4096 bits and ECC 384 bits (elliptic curve secp384r1). Symmetric Ciphers: AES-256-GCM and AES-256-CBC. SMCCD VPN with Multi-factor Authentication - Information Mar 27, 2020 Solved: VPN Client - Multiple Connection Capabi - Cisco