Help with Better Penetration & Timeline

[CHT]

I'm wondering how to quickly and easily reconnect bones that get disconnected after switching characters in the timeline. I tried using Ctrl+I to rebind the new character, but it didn't work. Using this Sugardust scene as an example, what should I do?
https://pixvid.org/image/gP53M

https://files.catbox.moe/93433w.png