I'm not up for the long game here either, but I found some of your claims/arguments interesting, so I thought I'd just comment in the old, evidence-free way
"I just, as invited, gave some arguments about against it. I do believe that if you're a vegan you're likely to have a healthier than average diet because you're by necessity conscious about what you eat and probably carefully choosing a variety of fresh food, rather than just stuffing your face with chips and ready meals, etc.."
Fresh veg and fruit are dear compared to the packets of cheap snacky food. I think many vegans junk out as often as other people. No idea if vegan junk food is healthier than other junk food! But if vegans are healthier than average, would you accept that it's not necessary to eat meat to be healthy. What's the value of this digestive argument, we don't physically resemble predators any more than plant-eaters. Anyway, no animal can cook. The whole evolutionary argument I find unconvincing. I say, let's evolve to be even better! This is assuming certain kinds of values, of course.
"Being (almost entirely) carnivore works for me as I can stuff my face with as much meat and dairy as I can afford and I've still lost fat, gained muscle (without having to exercise at all), got rid of a load of niggling health complaints, have more energy and generally feel brighter all round. Without having to think too much about it!"
Um. Is this an Atkins diet or variation? I don't have chapter and verse on this, nor the time to go digging, but I thought this wasn't supported my med evidence. Anecdotally, a friend who tried it was told he'd get a kidney stone, and it duly arrived within a few months. I wonder have you researched this yourself? I have looked on Pubmed at the studies of the benefits of veg+fruits and found it very convincing.
Gaining muscle, without exercise - so has it made you physically stronger? If it does, would you not get the same effect from plant protein sources?
"I admire vegans for the instinct to not want animals killed as well. I just don't think it's anything like as easy a choice as that though, as I outline above."
I think going by instinct is more reliable than abstract excuses. I don't have the time to research your 'growing plants kills lots of small animals' argument, though I do find it interesting. I would need to see evidence as the evidence of direct harm to some animals is pretty obvious.