Thank you for replying!
For one, alt textures for damage values is in vanilla 1.9, but it does not support ones that can't be damaged, and only supports a decimal value between 0 and 1 for a percentage of damage. It's too limited for what I need ( a lot of textures ), and also has a durability bar.
I've read the mcpatcher wiki over and over again, but the CIT part just somehow doesn't work. I tried other texture packs too (namely Sanity), but the CIT there doesn't work either. Some on that thread said it's happening to everyone. I have no idea what's going on now.