@KLoxxon Cheat-enacting and repealing only works to fix NPCs, so it won't fix the active household. Doing it from another household should work though. Sims can get infected any time you switch households with the annoying NAPs active, if they're in the zone, whether they live near there or not.
I fixed my contaminated save back in mid-June, and I've been playing (NAP-related) problem-free since then. I did it by disabling the pack, saving without it, then re-enabling it - a fairly destructive (but faster for my 84-Sim save) method. I'd only been playing a week with the pack though, and didn't know about repealing fixing things too - I don't think I'd want to do it again now. However you choose to fix things, make sure to turn off NPC voting and repeal the problematic NAPs first. Even with disabling the pack completely, when I re-enabled it, the NAPs were still active! (So I ended up disabling the pack twice.)
I do stick with the same four NAPs in every neighbourhood though, so I lose a little bit of gameplay not really using NAPs (or influence, since I don't have to out-vote NPCs - but most of my neighbourhoods are entirely populated with my own Sims though, so I don't want them voting for weird things anyway). I use Green Gardening, Eco-Friendly Appliances, Upcycling Initiative, and Clean Energy Production. They all have weekly inspections and fines for non-compliance, rather than buggy autonomous behaviours. Water- and Energy-Conservation should be safe too, if you don't mind the utilities going out occasionally. They only lasted one week in my game, before I got annoyed and repealed them, so I'm not sure how playable they are long-term. We Wear Bags also doesn't seem to affect played Sims.
If you don't have 4 NAPs active in a neighbourhood, you'll still get notifications every Monday evening that something won the voting - but it doesn't actually take effect. That, and things like Sims with the Active trait still doing push-ups or Sims playing with clay I forgot to delete, had me jumpy for a few weeks after I cleaned up. I still get suspicious and check every time they start to cook something on their own.
The Eco Footprint can be a bit glitchy, and has some odd effects on gardens, but overall it's nowhere near the level of brokenness as the NAPs.
Any saves that haven't been opened since installing EL should be safe - but turn off NPC voting before loading any households. I just opened one of my old ones, and there were no NAPs active.