No way we are doing that..................
The linked article in your first post mentions a 100% failure rate.
It isn't a matter of if it will fail, but rather when it will fail, then you will have real problems.
One thing not too clear from the article is whether or not the piping itself is a problem, as only the fittings are mentioned.
It might be possible to cut out the bad fittings and leave the piping/tubing, at least for the radiant, as long as the water temperature is within the specifications and the right tubing was used.
This also assumes that there aren't any hidden splices in inaccessible locations.
Getting the system hot and using a thermal imager might help to plot out piping runs and minimizing drywall removal.
You are now aware of the issues, and it is now on a public forum on the internet. Once your home insurance company figures it out, there will be issues, according to the article.
Is there a class action lawsuit or some sort of claims process?