VPN Server behind ISP NAT, no public IP

[phytowardt]

Hi,
I changed internet provider and discovered that the new one only offers IPv6 address not publicly accessible and a local IPv4. Probably IP NAT to local for customers. Their router is locked and doesn't allow DMZ or port forwarding, neither a bridge mode obviously.
I'm stuck with my VPN server and behind services unreachable from outside.

Can SoftEther setup a VPN connection in such scenarios without using Azure ? I read that Azure solution doesn't support OpenVPN and only runs on windows. I'd like to run the server on FreeBSD or even a linux VM, and access the server from Windows and Android clients

Anyone can hint me if and how it is possible ?
Thank you

[solo]

rent a VPS and install SoftEther server there

But VPN Azure + SSTP is fine on Open SSTP Client for Android.

[phytowardt]

rent a VPS and install SoftEther server there

But VPN Azure + SSTP is fine on Open SSTP Client for Android.

Yes, that I know. With a VPS I can install any VPN service and make a site to site connection
I thought that SoftEther could handle it natively after reading all the marketting around NAT traversal. But I see it is not really the case in this scenario