Hi,
Intriguing design. To answer your question, the MK 8 nozzles are not compatible with Pico. The reason being, Pico has an inner chamfer at the ends of the threads to seal the nozzle to the body for a leak free design. One can thread an MK 8 nozzle into Pico, but it may leak due to the missing chamfer.
I hope this helps and good luck with your Kickstarter!
Mike
The B3 Team