No i'm not, i think that contrary to physical pain or even disturbing noises, aroma/taste is some of the easiest senses to overcome, some psychological change of perspective is enough, for instance while some people can't stand bad smell, i just tell myself it's just a smell, if it i was associated with something neutral instead of shit/piss for instance, i would fele less disgusted, it won't hurt me, it causes no pain, it's mainly psgchological, and it works, so i have absolutely no doubt i can manage that with Nembutal too, sure it would be an awful taste, but it's just a taste, one of the least offensive and most manageable senses, it causes no pain, it's not a tootache, not a disturbing noise, not an ache, not a knife being plunged into you ... i will just close my nose and drink it, as long as i continue drinking and let the disgust not interefere with it, it will be okay, the only problem would be vomiting but i would be taking antiemetics.
Don't try to fight over the bad taste, just be confident that you can drink it despite it, it's not painful, it's just a bad taste, if that taste was associated with something good, it would be more manageable, so associate it with liberation if you want, and in all cases remember, it's just a taste.