It's super cool that keyshot has a built in perspective matching tool. But since it doesn't allow you to control the origin, or scale....it's less useful.
Fspy isn't the Best I've seen, but it works well.
But I'm wondering if there's a faster way to get things into keyshot. My path right now would be to use fspy, then import into blender, fbx out, then import into keyshot.
Any way to skip the blender step?
I don't think there is an easier way, but I have made a note of your request for Development.