WireGuard Port Forwarding & Static DDNS (CGNAT Bypass) NOIP

I already have a working WireGuard tunnel between my Linux VPS (server) and a Cudy 5 G router (client) that successfully gets me past the carrier’s CGNAT. Now I want to drop a DrayTek router running DrayOS behind the Cudy and expose it cleanly to the outside world... (Budget: $10 - $25 USD, Jobs: Linux, Network Administration, Network Monitoring, Network Security, PHP, Shell Script, System Administration, VPN, VPS, Wireguard)