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There is a precedent to having a drain directly into the oil pan, some LDS465-1 engines equipped with an IP with a separate drain.

IMHO, I think it would be pretty safe to run a hose from a banjo bolt straight back, it's fairly high up and on the 5-ton (LDS) engines, the oil pan is installed with the deep part behind the front axle. Adding a port a little higher up on the side of the pan could turn into a project in itself...

Here are the measurements of the oil drain plugs on the pan. It appears to be a 7/8 dia with 20 threads/inch. It takes a 1-1/8 wrench. It comes from a parts engine, that's why the rust.

...and you punch the hole for it to avoid shavings and metal chips in the pan. Some thoughts on the subject: http://theoildrop.server101.com/forums/showflat.php?Cat=0&Number=602475&an=0&page=7

These are Amsoil solutions for the return flow.

You know Patrick, it's just my opinion, I don't know, but why take a chance when it's just as easy to run it into the pan directly and may even promote the flow thru the bypass filter.

Don't thimk that's a good idea, returning it to the oil pan minimizes interference with normal oil flow.

The output of the bypass filter must go to the oil pan without flow restriction. A hole may need to be punched in the pan above oil level and a suitable fitting installed (drilling is only an option if the pan is off the engine). I would feed the bypass filter from the port labeled "Oil sampling...

I'm sure that there is tons more out there on this subject, I want to emphesize that the beauty of the bypass filter is that it does not change any of the original design goals for the engine. Even if completely clogged there is no difference in normal filtration or oil flow.