if you could get by with half the oil drain capacity, the factory oil drains would be half the size (DON'T DO IT!)
I would tap into the pan. just punch it as high as is feasable. they way we used to do it on supercharger installs back in the day is take a punch and literally punch the pan and keep punching it larger and larger until you can tap it with an NPT tap. lots of grease on the tap, obviously. you can run an NPT to hose nipple. teflon tape or silicone on the threads. if you want you can tack the fitting to the pan to keep it from backing out.
or, you can forgoe the whole punch it out thing and drill it and just weld a bung, but you need to be concerned with the metal filings in the pan obviously. if you wash the pan out with diesel, the drain plug should catch anything that doesn't get flushed, but an additional LARGE magnet on the sump is good insurance.
personally, I would explore every option to NOT pull the pan! LOL
