I’ve seen the above done once before and it was awful. I think ‘Guise of the Wolf’. Total Biscuit did a review funnily enough and he couldn’t let it go lol. Doubling polycount everywhere doesn’t seem like a great workaround to me. I’d be more tempted to go into the engine, switch to ES3.1 + AEP and turn on post effects somehow.
That, or fake it with a fresnel effect.