So after a few weeks I finally achieved what I wanted. I can access local services in my home network and also browse the internet as if I were home. For anyone wondering the same, this comment helped me cross the finish line. On the OpenWrt side I only added a firewall rule that allows Wireguard interface access to WAN and LAN.
The only concern I have is how much the VPS provider can spy on me. Unfortunately, I don't see a better choice.
Thank you everyone for helping out.