oil drain line to oil drain plug on pan?
 

heres a stretch of an idea. could i run my oil drain line to the oil drain plug on my oil pan and attach using a banjo and banjo bolt. the problem i anticipate from doing this would be that the banjo would not be big enough to allow all the oil to drain probably into the oil pan and id get a back up of oil in my drain line and turbo.

The oil wont drain correctly seeing as the drain plug is at the bottom of the oil pan and you would be trying to drain oil into oil. The Turbo drain line needs to be as close to the top of the pan as possible so the oil will actually drain out.