Fumoto valve is the way to go, you can get them with a nipple on them, which allows you to put a 3/8" plastic hose on it, which allows oil to be changed, and directed to wherever you want to go.

Info@fumotovalve.com

Will show you all.

On our ML270, the drain plug is right over the crass frame, the last place I would want to cover with used oil.

Once the valve is in, it never needs to be removed.

Regards

Col Tigwell Downunder