I have a decent functional katana (hanwei practical plus xl light), and decided to at least see how feasible it was to try and sharpen it on the WEPS. Clamping is next to impossible, you have to prop it up or it just falls down. It’s also so wide that it barely fits in the vise while still being able to tighten. Mine also has a bo-hi (groove) on the spine, making it even more painful to try to clamp. And then there’s the problem of blending the different sections you sharpen together.
I had previously tried a two zone sharpening on a 12″ bowie; sharpening the back completely, and then the tip half. It works “ok” but there’s a very obvious transition that I had to work on for a long while with the strops to get even partially acceptable.
Overall, I have to say “no, the WEPS cannot sharpen swords”