Today I was at a hydraulics store getting some parts and asked them to make a drain hose. This version is very slim and that is it's flaw too. The hole is very narrow, only 4mm and hose is 1/4", so I'd think it takes some time to drain.. Would be better to find low pressure fittings with larger openings.
This was just an experiment and I'm not even sure if I want to start grinding my bike to make this mod work.
Maybe I'll just stick to the old messy method..