alt Hacker Newshttps://github.com/sc0ty/subsync
It can sync from audio in the video or from another srt. Target srt can be in different language than reference.
EDIT: Two forks, but I haven't tried them as I'm still using the original as it still works well even though it has been archived.
I think the original SubSync was the useless linear tool I tried last time. Though the Sefzz15 fork added some kind of "piecewise" feature which might work.