Do you use it with a single network port or do you add interfaces, via USB? Wasn’t there a performance limitation at least on the USB ports? Maybe the 5 has better specs here?
Did you look into GL.inet routers? The have OpenWRT under the hood? At their web shop cheaper than at Amazon.
CF Tunnels. Based on a reverse proxy in the cloud with a VPN between local and CF. So different from a direct IP connection.
Or: IPv6 could be a way out.