Thanks for sharing! I hadn’t seen the Pokka before. 
I’ve been carrying a raw brass Bullet with a Zebra G-301 gel refill in it for a few months.
I used the stock Fisher ink for about two minutes before swapping it out. It usually started out kinda blobby, and I don’t need to write upside down. 

The Pokka is interesting, but looks a bit odd when closed, like something fell off the end of it. 