Upon re-read I realized you’d like to use a comercial vpn as well (for bypassing restrictions in your country).
You can setup your self-hosted vpn to work in tandem: Your phone stays connected to your own vpn keeping it part of your home LAN, then you setup the device hosting that VPN to also connect to a comercial VPN, routing all LAN traffic headed to WAN to instead go over that comercial vpn escaping the restrictions in your country.