I do sympathise. I give up coffee for sometimes a week but i always go back to it. All it takes is a low energy day, maybe bad night, and i'm back on it.
I've often thought if i could drink coffee i would find it easy giving up the food on a fast.
If you are going to use it just for a day or two, and only two cups, well i personally don't see that as a problem but i know everyone else will disagree.
I see it as a means to an end. The stevia is probably not a good idea though. I don't take Sugar in tea or coffee so that is not a problem for me. I do prefer it with just a dash of milk rather than black, but would rather have it black than not at all.
I think further into a fast it would be dangerous to consume coffee though.
I'm going to try EFT again for coffee cravings. It seemed to work once before, for awhile anyway.