However, the only thing being lubed from that galley is the lifters. 8 large leaks spraying oil that could be better used on the crank.

Putting oil in at the end of the system there basically fills the galleries from both ends. Intended to stop the oil from flowing through and ensuring the entire system is consistently full and pressurized.

Again, solid lifters or not oiling the top end through the pushrods, or oiling the heads externally, plug the left galley and make it dry, eliminating the problem.

Using an internal auxiliary hose/tube can be beneficial, if the left galley is plugged and the oil is plumbed into the rear of the right galley, filling it equally from both ends.