Only single packages from trinity on a Plasma system?

Hi, there is one software the development of which was stopped before KDE moved to plasma, and hence it requires KDE 3. That's why I have TDE running on a virtualbox. I would prefer that package to be available within my system, but I didn't succeed so far. The worst case that happened was that it rendered my system almost useless. Here is the setup: I run Manjaro stable up to date, an Arch derivate. Trinity or TDE is not available for that distribution, as far as I know. I want to use Quanta+ from TDE. Is there a way to get that done? (Maybe I get my hands at the source code some day, but I have no experience with C++ and am not sure if that will ever yield workable results). Regards, Martin