When you say with the exception of the final battle or the battle against Manfoy, do you mean those are not included at all or that they are not compressed like the rest?
Yeah I can imagine. I feel that Hilda could add something to the setting in just being an unrepentant villain to the core, since so many others get layers and depths so having her just be wicked as some people actually are could accomplish something all on its own.
I have done some minor cleaning in the past for translations of fanmade comics of things, but my work by no means was 'clean' itself: just enough to do the job, so I will not profess to be an expert. I am interested in helping, though I would have to know what it all entails before I say yes of course. Once I handle some stuff I am presently busy with today/tomorrow I'll reach out to you and hopefully will be able to be of help, even if it means having to learn a few things.