Airvpn, then use their advanced config to create a 443 tcp tunnel out to a single server. Then use that server’s IP in your OpenVPN config file. Route all traffic including dns inside the tunnel.

Traffic will look like all other web traffic - encrypted on standard web ports. You won’t even need to do a DNS lookup to start with and airvpn uses generic rDNS so it’s not super easy to figure out from their perspective.

Been using them for many years and several instances I leave permanently connected. I can’t recall a single instance of AirVPN disconnecting from their side.

Try AirVPN. They allow port forwarding and have fairly extensive configuration options.