@Kriss E , neither of those two conversations that I mentioned included suggestions of keto for strength. Perhaps keto is good for strength but I doubt it, as it's necessarily a low-protein diet as well, since dietary protein is predominantly converted to glucose. I only see keto/fasting suggested for the brain, digestive issues, cancer prevention and treatment, auto immune issues, and body fat. Like yourself, I do not have the willpower for long term keto.
I did not try veganism for long. The reaction that I had was almost certainly to soy rather than to the absence of animal products. I was going to pee every 20 or 30 minutes, and I'd get a hot sensation. I later checked with a urologist, and I chanced upon a world-class urologist who publishes in the top journals, and he said that a lot of men simply cannot tolerate soy, and that he advises lots of clients to avoid soy. Given that I eat out a lot, a vegan, soy-free diet would be a low-protein diet for me.