the basic consensus is that we're lucky that mobile browsers are able to run smaller webGL unity games at all. with the size of the zipped folder approaching 50mb (most of this being composed of images), there's basically no chance of the game loading properly before getting aw snapped
i don't own a Mac, but in theory, a mac with Xcode installed should be able to take the output of the unity iOS build and create an app with it. i have no means of testing this though