It can be done, it is ugly but functional. The evac valves are a "one way" valve anyway so water will not travel back up the hose.
It does help keep your engine cleaner by preventing your breathers from dripping oil on your covers... ..And you are not pulling oil mist into your intake mix from the normal PCV setups.
Just TIG a stainless nipple on your tailpipes for the evac valve to screw on to.