Here are a few things I thought I should mention.
1) Tor devs do not recommend using Tor for P2P / bittorrent. (This includes other P2P file sharing protocols. Tor network bandwidth is not unlimited. | https://blog.torproject.org/bittorrent-over-tor-isnt-good-idea
2) Currently not possible because Tor only supports TCP. Fopnu is UDP only. You can not use SOCKS or HTTP proxies with UDP traffic. This is why there is no proxy support for Fopnu.
3) Your VPN choice isn't limited to OpenVPN. You can use a different VPN protocol such as Wireguard or IKEv2. If you are using OpenVPN, make sure you are using it in UDP mode and not TCP. If you can, consider setting up your own VPN server or pay for your own VPN. You can find an outline for Wireguard here: https://forum.tixati.com/offtopic/337
It's easily translatable to Fopnu. Just ignore the iptables rules that include TCP because Fopnu doesn't use it. And maybe pick a different port if you want.