You won't need specialized nozzles, you understand the material wrong:
The benefit the properties of this material grant is not super fine prints (which you can get with small nozzles like 0.1 mm already), it is that you can print at super low temperatures. Printing it at standard 200°C will mean, that it won't solidify in the time the printer needs it to, ...
I have been looking for some where that could make a custom nozzle and the only place I have found so far that I think might be able to is: https://www.emachineshop.com/
You would need to draw up the design of the nozzle in the software on their web site and see if they could make what you want.