Editing a torrent file to add/edit a folder/file

Lets say i have a torrent and it has a movie, the sample and the nfo in it.
I want to edit the torrent so it can include a subtitle file.
But the files are in my seedbox, and its going to be slow to recreate the torrent i had for it.

Now i wanted to upload something and the folder had the rars inside, but since the tracker allows only unrarred files i had to stop seeding the rarred torrent, move the rars to another folder then create the torrent again.
it would be faster to make a torrent with both rars and the movie file inside, then get the torrent to my pc and edit the rars out and save it again.

Is there a way to add a file in .torrent or doing something like in my example without remaking it?
maketorrent doesnt do that.