honestly I always fed my young sows with normal, soft and cheap hay (Vitakraft, Gimby, etc); never bought timothy. Rarely as a treat I give them Bunny Heu, but rarely. They have been eating fresh grass since the beginning. Never given alfa alfa and they have grown up amazingly (now they are 1 year and one weighs 1100g and the other one weighs 950g).
Bell peppers have (should have) enough vit C. In Guinea Lynx website you will find charts of all the vegs, also the list of the vegs richest of vit C.
I prefer soft hay because of the risk of eye poke. Piggies go through the hay keeping their eyes open; a lot of times some little piece of hay went into their eyes, but nothing happened