It is possible to include the content pipeline in a game, but only for a game aimed at Windows desktop, Linux or OS X. It is also quite complex and comes with a lot of extra baggage (the native libraries and executables used for importing and processing the data).
I would recommend looking at a custom font implementation that is specific to your requirements. It will be a lot simpler and you have full control over it. You could make the custom class look and feel like SpriteFont, but it won't be SpriteFont itself.