Just be forewarned that Alfredos is closing sometime in August. I can't remember the date, but it was reported here and on allears.net.
Also, Yorkshire Fish sells the same fish n chips that Rose and Crown does.
For those lunch TS meals, sometimes you can eat as late as after 3 pm if you want lunch to hold you until late evening.
Regarding sharing, just remember you will not be allowed to share the cost at buffets, preplated and all-you-can-eat meals. These are charged per person. Even still, careful choosing can make these a real value.
Elsewhere in EPCOT, Biergarten has the same entertainment and similar food at lunch as dinner, for much cheaper. I'll leave it to you to decide if the price is right.
If you want to experience the restaurant, but not pay for a big meal, California Grill could work. Eat a big lunch beforehand. They have a sushi menu and flatbreads, most of which you can share easily, and they are most friendly about it. Might be a great way to see the best of WDW on the cheap (and if you time it right, you get fireworks, too.)
Also, Wolfgang Puck Express (in the Marketplace, NOT West Side) at DTD has great pizza and many say is the best CS on site.