You'll want to mix the ABV into whole-fat milk or cream over the stove, just bring it to just under a boil and let simmer and stir for 10 or so minutes then mix into your coffee. If you prefer to drink your coffee straight and don't mind a reduced effect you can just mix the ABV straight into...
I lost the mouthpiece tip for my SR74 so I improvised the above. The piece was $20 from the LHS and bolts right onto a K.I.S.S. Globe (without the globe) or a Hercules with the adapter I made with a 14 to 18 converter. Still wanting a Nibbler XL once they're back in stock, but this will do