The patch for using HackedServer neatly on a bungeecord server is now available (but it is still in the test phase).

How to use it ?
-> Install hackedserver-spigot-2.14.1.jar on every spigot server (you no longer need to disable fake forge handshake in the config)
-> Install hackedserver-bungee-1.0.0.jar on your bungee server

How does it work?
This patch running on the proxy will intercept the packet containing the list of mods of the player to its connection then clone it and keep it in memory. When the server returns a handshake, it will block it to prevent the client from crashing and emulating a response based on the intercepted packet clone.