Amiga.org will not be changing to accommodate outdated web browsers that don't support CSS properly. Even the Greeks back in Plato's time had a more modern web browser then some old Amiga browsers. The problem lies with the developers of those browsers not Amiga.org. As many have already stated there are other browsers available that are more modern.
Trying to kluge something together for an outdated browser would be a disservice to the Amiga.org community and a waste of time. If you want your favorite Amiga browser to support modern websites then contact it's developer and have them update it. If they don't updated their code you have gotten to the source of the problem. Support developers that are making progress and releasing new, up to date applications.
And I'll add that Amiga.org does actually "work" with IBrowse, it's just not pretty.