In any case, the plain steel strings from Elixir are not coated in either the guitar or mandolin poly- or nanoweb sets. They're just ordinary plain strings. Only wound elixir mando strings (half the set) is coated. 11.5s are not so common, but you can find plain steel 11s, 15s, 16s pretty easily as single or bulk strings. What I would like is the option of buying coated G and D strings by the dozen, and find my generic plain steel strings somewhere else for a few cents each.
"Listen louder, play softer"