Yeah it's really tough, they really rely on their sense of smell to eat and when that starts to go (or if they get cancer in the nasal passage) I think there isn't a lot to do.
I always regretted that I couldn't find just cat "gravy" - you know, like the liquid "gravy" that comes in some canned food. Mine would eat that before anything else. The pouches of "broths" just didn't do it. Jaayse is right about the microwave, but I didn't have one either. I would take some very hot water (like boiling) and mix a small amount into the canned food, which I would leave out (covered) for up to 24 hours so it wasn't fridge cold. I also, when I made chicken for her, would save the poaching water and reduce it way down so it was concentrated and used that instead of water if I had it available. She seemed to like that (and it added flavor and more odor than just water when mixed in). She would drink tuna water too, but lap the water up and often leave the actual tuna (or only eat a small amount). Maybe you could use people gravy, I bet the fat content would make it more appealing... just make sure there's no onion or garlic in it.
Good luck...
ETA: I don't eat meat either so cooking it is... meh. I would poach one chicken breast at a time in a small saucepan. Super easy and takes about 20 minutes. Also, my cat was more likely to eat it when it was very warm (again, the smell I guess).