I have done it.
I have a small 12/120 volt percolator made by NESCO. The paper with it says it is model 1660-58. It plugs into the wall, and makes 4 cups or two mugs of coffee in 12 to 14 minutes using 435 watts of 120 volts AC. With an adapter, it plugs into a cigarette lighter and makes coffee in about half an hour, using a separate 165-watt heater. I have a lighter socket on my Wee-Strom, wired through a 20-ampere fuse to the battery. The fuse holder gets hotter than I want it to, so I am going to solder the fuse into the circuit. The improved connection will prevent overheating at the fuse.
I run the coffeepot ten minutes, then start the engine and run it until the coffee is ready. My 2006 DL650 with its original battery is happy to start the engine after ten minutes of making coffee, but I don't want to risk having a dead battery, so perhaps I waste some gasoline.
The above link does not seem to disgorge any coffeepots, so perhaps they have stopped making them.
It's cute how they simplify the use of this pot. The wire has three conductors in it. The 120-volt heater is wired to the two prongs of an ordinary 120-volt plug. A hole (not centered) between the plug's prongs attaches to the 12-volt heater, so a little adapter fits between the ordinary-appearing plug and the 12-volt receptacle.
The pot is made in Two Rivers WI, by the Metal Ware Corporation. Long ago I complained to that company about the early demise of the heater in another entirely different coffeepot, and they sent me a replacement element at once, with a cordial letter of apology. The pot worked many years after that.
I will be depending on my coffeepot while I am riding near James Bay in northern Québec this summer. If you want one like mine, I hope that you find it.
P.S. Here's the blurb that comes with the pot:
PPS This might be faster: I haven't tried it.