The thing is, Troy, that you’re not getting many responses because almost nobody here plays the Paraguayan harp. I’m from S FL so I know a fair number of Paraguayan harpists but they all either make their own instruments or import them from harp makers in South America. I don’t know of anyone with any experience with any of the ones that interest you.
I’d suggest you might want to try the facebook page for the Paraguayan harp. I think it’s Paraguayan-harp. Maybe somebody there would know more than the folks here.