i have heard all about this. so imagine my surprise on my TF diet (on a road trip day that involved mostly a day of liverwurst on sourdough rice pancakes and water only for a 12 hour journey) to find that my ph was 8. my midwife was not surprised, but very pleased. so, it's not fats or meat!!!
bone stocks are EXTREMELY alkalizing. i try and make sure my meats are balanced by always cooking with bones, and then making stocks with the bones and often just drinking them.
i juice greens many mornings (cucumbers/kale/celery/lettuce), eat minimal fruits, minimal sweet foods of any sort, though i do enjoy a nice homemade sorbet, or raw cream ice cream w/ maple syrup. my whole family drinks kombucha, eats fermented veggies, fries everything in lard (from our friend's biodynamic farm), and eats dairy as well. i was a raw foodist (not vegan, still did minimally cooked meats as well as some raw fish, and raw dairy) and actually had to add in more cooked foods after a few years, and i think it was because my body was so alkaline naturally that it needed a balance.
doing a cleanse, with raw juices, and upping the bone broth, while easing up on unsoaked grains and anything sweet could really help swing your husband over to a more alkaline and balanced state without sacrificing what you already know to be important to his diet.
also, fasting (intermittent fasting vs. long-term) can be very beneficial for some people. it has the benefits of detox and long-term caloric restrictions, but is often very easy.