Why cloudflare tunnels? If you already have a domain, and are going to use cloudflare, why add their dns nameservers to your registrar admin page, and use their dns for free?? That solves the issue of hosting at home and showing your ip to the world via any method using your domain name, all they’ll see is cloudflare.
Absolutely! Subdomain all the things!. As long as it’s at a different port you’re good to go