Maybe try to isolate the sound if you can find one freq that's it's really hitting hard then try the high pass. Also the more layers you add to the post sound the more stuff will get buried. I've been the foley artist on a few features and I couldn't believe how many layers were added in post. So if you're just listening to it without anything else, it might sound worse than it is.

Cut in usable audio from other takes (you have some, right?) at those specific moments that need replacing. Don't worry about syncing with picture, that's what cutaways are for (hopefully you shot some of those too). Sometimes bad sound is the cinema gods telling you that a line is a throwaway - can you live without that particular dialogue? Masking discontinuities with motivated sound sources is a normal editing technique, so use sound fx if they make sense within the scene. Constant wind, traffic & aircraft noise are the only things I think demand ADR; most other noise can be cut out or around or masked with music or sfx to make them less noticeable. Good luck!

I think the question is answered in the topic - sadly if it's bad enough to be angsty enough to ask here it needs re-recording - ADR and wild rerecords are part of the process of production - know it might fiscally hurt or may be not possible but next time ....