Ok, those are big cups. I usually made around 250 to 300ml of coffee. Timemore and 1zpresso have big grinders now, you may want one of those. I bought a C2 a few years ago and even though I have a good electric grinder, the Timemore is miles better and because it doesn’t make almost any noise, I can make coffee early in the morning.
In my case, I am the only one at home that drinks coffee so I rarely need more than 25g.