I've got quite a lot of experience with car filler.. too many years messing about with VW's so happy to work with that, I just wanted to replace it with "original" material, wood out = wood back in
Of course I would not do this if the damage was lighter i.e. a few mm, but in this case its about 1/2 inch that is broken off i.e. though to the t moulding slot. I will need to make sure i use a very strong glue that is thick enough to go into all the texture of the chipboard to form a really string bond, i intend to clamp it on while it sets
If it does not work out i will use a router to remove it again and switch to car filler