Hello, i have a character that holding a knife but weapon has bones attached to the “Spine” bone. When i try to retarget it, weapon flying because i don’t know how to fix or retarget it. Here you can see how they modeled the character;
@Galasdaer were you able to resolve this issue? I found this video that might be useful to you: https://www.youtube.com/watch?v=pa9AjL36wdY&ab_channel=OwennN
I really appreciate you, my friend; this has truly helped me a lot 
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we can edit the skeleton add/remove joints until it matches the target skeleton. if we want to add weapon , we can attach through a socketting method later.