How to import OrCAD designs to KiCad

Converting via altium probably works if altium can import orcad projects.
You could always ask on a forum if someone with a license for that program can do it for you.

There are probably also commercial companies which do such conversions for a fee. There are even companies specialized in reverse engineering PCB’s. You send them a PCB, they peel it off layer by layer and create gerber files. And apparently the fee is only a few hundred EUR.

And you always have the option to reverse engineer a KiCad PCB from gerber files.
The process is not flawless, but it’s a lot better then “nothing”.