Reaper
mods makes a kit for the Orchid, but It doesn't look much/if any smaller than the original, I'm thinking shrinking it down much further you're capacity is going to be like 1ml.
https://www.facebook.com/ReaperMods1
My time to play around with the orchid was limited compared to my experience with Kayfuns, so I might be biased, but overall I still prefer Kayfuns. Performance on the orchid was far superior because of the dual coil ability and significant increase in airflow over a kayfun, but I had tons of issues with either leaking or burning.
From what I've read it's supposed to be built with wicks IN channels, unlike a kafun, but because of the channel's size it's kind of difficult to know when you have the "right" amount of wick in the channels. I kept getting burnt hit one after another, even after several tries.
Then I wicked it more like a kayfun, trying to position the wicks so that they will not allow
juice to fall into the center hole. Then it wicked fine, but I was getting constant leaking.
So, purely from a performance aspect, I'd say the orchid definitely beats the kayfun. For ease of use and reliability I'd say the kayfun still nails it.
EHPro's big buddha deck on a 22mm sized kayfun would probably be better than both though!