You can add the device you want to use PiHole with to your WireGuard VPN and set the DNS property for the Interface.
Then you need to add the PiHole machine to the VPN, if it is not already reachable (or you use your existing machine in the internal networking with masquerade)
I use tailscale on my pihole container and add the tailscale ip as dns for all tailscale devices. Then u just have tailscale one your phone laptop or w.e and will be using that dns. No ports opened at all.
Sounds like you need Cloudflare. The free tier should be just fine.
Cloudflare DNS proxied dns to be exact too. They also allow DNS only which is not routed through Cloudflare and the services.
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