I really like the Origen and don’t feel that it needs a narrower gap. It’s pretty responsive as is, even running the bearing stock (I’m not sure if it was pre-lubed; I haven’t really taken it apart a lot). I don’t like the finish, so if I was going to mod it I’d try to change that either with tumbling and roughing it up or trying to strip the anno entirely.
If you want something for tinkering, the Butterfly XT plays modern responsive well right out of the package, but it can be modded with weight rings, can accommodate a slim or full size C bearing or blank, can swap caps, can install mod spacers to make it wider, and is cheap and ubiquitously available in the USA.