A further update (and a more positive one!):
After consulting with the newly established ACARS Drama legal team, we've made some more changes that should balance out the legalities we were recently challenged with AND the main goals of our little project here - which is purely a hobbyist escapade for plane nerds and nothing malicious.
I'm very hopeful these will be the last changes we make to resolve this mess, so here goes:
1 - We still have to remove the identifying info (tail #, registration), sucks, but it was agreed this was a must.
2 - We have to demonstrate that we are not creating a 'real time aircraft surveillance' product/service - so the posting delay remains BUT we've shortened it to 5 mins.
3 - We added back in the area. It's possible we may have to remove these from non-US feeds in the future - but for now they are back.
So better, still not as good as it was, but better.
Thanks for the support, as always.