I think as long as there is a slope to the oil line in either direction it will help dislodge the bubbles. Personally I think that it would be better to have the bubble come up to the tank instead of trying to make it go through the pump... But having not seen the route of the oil line, i don't know which way would achieve this... Personally, if I had a bubble in the line, i'd do it right, and not complain about how much of a pain it is to bleed the pump. Because I know for a fact that will get the bubbles out. So for me, that would make it worth the work. Ultimately, how much work is it to POP the throttle bodies vs taking the engine out, or doing a top end? It's a no brainer, and I can't believe its not being done...