Before you make all that stuff, you should probably try it out on him! I can tell you that my ig is not interested in anything that's been chopped up really finely, and certainly not ground to a paste. They're natural foliovores, and are attracted to eating leaves. As a paste, it's not recognizable as leaf-food any more, and it may not look appealing to RC. Paste would be good if you had to force feed, I guess. I don't think my ig would eat it. He likes his greens in bite-size pieces, or a little larger. I've heard from other owners that their igs also prefer their food this way, although I'm sure not all igs agree exactly. 
Also, igs like variety. If it's a homogenized paste, every single bite will taste alike, for 3 whole months. Iguanas can and will get bored of their food if there's no variation. I try to use a bunch of different greens, and rotate some in and out of his diet. I use collards, mustards, dandelions, turnip greens, and escarole on a regular basis, though only 3 at once.
It sounds like maybe the diet could be heavier on the greens, lighter on the alfalfa. Alfalfa is good, but 4 cups?! Remember that these pellets are a lot denser than greens are. Diet should be about 60-65% fresh greens. Fruit should only be about 5-10% of the diet. Use the brewer's yeast if you plan on freezing, but if you have a good balanced diet you probably won't need all those supplements.
The way I do it, and of course you don't have to do it the same way, is to make up only a few meals worth of salad at a time. (Lizard eats 2x per day.) I take 3 types of greens, such as collards, mustards and turnips, and rip them into pieces. (Smaller than what I would use for a human salad, but not tiny.) Then I add some other veggies. He loves butternut squash, so I usually use that and then maybe snow peas, green beans, or green/red pepper. I use fresh fruit as a treat or "dessert" - if I mix it into his salad, he only wants to eat that! He's very fond of strawberry and apple. Lots of igs like berries a lot. He gets a salad plate full of salad. (That sounds obvious, doesn't it? By that I mean a regular sized salad plate that comes in a dish set.) After I described his diet, my vet recommended that once or twice a week I sprinkle some reptile vitamin supplement on top, just to make sure he's getting all the vitamins he needs.
I hope this helped a bit. 
Kate
