Yes at 11 weeks your pigs will be fine on 2lb per day whilst they are inside.
When you take them out side a would increase it slighty to 2 and a half pounds but keep feeding the veg aswell.
When they go outside they will need that bit more because of the cold at this time of year, indoors they dont need as much because its warmer and there not moving around as much hence no using the energy.
If you want to go down the route of indoor pig rearing then there are lots of breeds suitable (landrace,large white, hampshire, welsh, duroc, pietrain crosses but thats if you can get your hands on any) however they will not produce the same quality meat and indoor pig rearing brings many challanges it's nowhere near as easy as outdoor rearing. For example indoor rearing legally you must provide your pigs with activety I.e toys, you must ensure they get a certain amount os space per pig, you will be constantly giving them fresh straw, you need to ensure you have the correct amount of light going in, you need to ensure you have the correct ventilation and even on top of these factors you will always end up with far more health problems indoors, I.e rhinitis, pneumonia, joint problems of fast growing commercial pigs, tail biteing, bullying... the list goes on and on..
If were you I would try your hand at tarditional breeds outdoors before you venture indoors! Not mention the only people making any money in pigs at the moment are the people with rare breeds, although on the scale most people tend to rear rare breeds the money only just covers cost with a bit on top!
Do you have a market for the meat already and a buthcher lined up to cut it?