Thanks for the info! I’ve already tested it and installed a K1 nozzle for Creality printers. The difference to the Sovol nozzle is only 0.5mm. In my case, the nozzle is from Fysetc, made of steel and has a diameter of 0.5mm. I’m a bit of a fan of 0.5mm nozzles. The print quality with Arachne is barely distinguishable from 0.4mm, but with 50% more throughput, it prints much faster. Furthermore, the nozzle doesn’t clog as quickly with carbon or fiberglass.
I’ve discovered another option, though. There are 6mm adapters for Quidi nozzles, and these, when used with a Creality Sprite nozzle, produce exactly the right length. I just haven’t tested them yet. The tip geometry of both also matches the original Sovol nozzle.