The hardest part about removing the oil pan is getting to the bolts under the cross-member. Since you're doing a crossmember swap, thank you lucky stars and just stick with the oil pan!
An easy way to get the return to work is to use a bulkhead fitting. I used a 45* -6AN for mine, works great. A few things to note: Pay attention to the pan bolts when selecting a location for the drain. I didn't and the bolt underneath is a bit of a pain to get in. Make sure it clears the engine mount, mine does, but its a little closer than I would have liked...
Just drill a hole and bolt it on. See my location below, I would have liked to mount it another half-inch towards the front of the car (top of picture).
Good luck with the project!