You can build multiple Main files into a single js file by passing them into elm make together. For example, you could run elm make src/Init.Main.elm src/Main.elm. This will produce one file with one instance of the elm runtime and with both of your entry points. When you import the file in javascript, perhaps as Elm, then you reference them like: Elm.Init.Main.init(...) and Elm.Main.init(...).
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