I'm a kde user as well, and since I'm on ubuntu and thinking about switching to something else I did a quick search to see if it was possible to run kde on mint and it appears you can. You have to add the kubuntu backports ppa ("sudo add-apt-repository ppa:kubuntu-ppa/backports") and then you can install kde using apt ("sudo apt install kde-plasma-desktop").

I haven't tried this, so I don't know if it actually works well or not, but it is apparently possible.