Thought maybe the dev guys might look into it
SoftEther VPN is free open-source, cross-platform, multi-protocol VPN client and VPN server software, developed as part of Daiyuu Nobori's master's thesis research at the University of Tsukuba. VPN protocols such as SSL VPN, L2TP/IPsec, OpenVPN, and Microsoft Secure Socket Tunneling Protocol are provided in a single VPN server. It was released using the GPLv2 license on January 4, 2014.
SoftEther VPN supports NAT traversal, making it useful to run VPN servers on computers that are behind residential gateways, facility routers, and firewalls. Firewalls performing deep packet inspection are unable to detect SoftEther's VPN transport packets as a VPN tunnel because HTTPS is used to camouflage the connection.
SoftEther VPN optimizes performance by using full Ethernet frame utilization, reducing memory copy operations, parallel transmission, and clustering. Together, these reduce latency normally associated with VPN connections while increasing throughput.
SoftEther VPNSOFTETHER VPN ADVANTAGES
Supporting all popular VPN protocols by the single VPN server: SSL-VPN (HTTPS) OpenVPN IPsec L2TP MS-SSTP L2TPv3 EtherIP
Free and open-source software.
Easy to establish both remote-access and site-to-site VPN.
SSL-VPN Tunneling on HTTPS to pass through NATs and firewalls.
Revolutionary VPN over ICMP and VPN over DNS features.
Resistance to highly-restricted firewall.
Ethernet-bridging (L2) and IP-routing (L3) over VPN.
Embedded dynamic-DNS and NAT-traversal so that no static nor fixed IP address is required.
AES 256-bit and RSA 4096-bit encryptions.
Sufficient security features such as logging and firewall inner VPN tunnel.
User authentication with RADIUS and NT domain controllers.
User authentication with X.509 client certificate.
1Gbps-class high-speed throughput performance with low memory and CPU usage.
Windows, Linux, Mac, Android, iPhone, iPad and Windows Phone are supported.
The OpenVPN clone function supports legacy OpenVPN clients.
IPv4 / IPv6 dual-stack.
The VPN server runs on Windows, Linux, FreeBSD, Solaris and Mac OS X.
Configure All settings on GUI.
Multi-languages (English, Japanese and Simplified-Chinese).
No memory leaks. High quality stable codes, intended for long-term runs. We always verify that there are no memory or resource leaks before releasing the build.
More details at http://www.softether.org/.
Appears to even have a VPN Server Manager for Windows...which means you setup the VPN, then use a GUI on a windows machine to control it remotely and set it up
From the wiki
Looks like they even have binaries already for debian...both stable and testing
Seems like it does ALOT and maybe it can run on ARM and ARM64...who knows...a one stop shop for VPN