Not going to completely disagree with you here, but OP’s illustration shows that they were asking about essentially jumping off the red line from the section of the mountain between the pathways from the North and West Blues.

OP simply seems to be disregarding that unlike the terminal at Mariejois, there’s no infrastructure to allow ships to cross over the Red Line. This is a supercontinent we’re talking about here (on a world much bigger than our own). The brevity of the journey through Reverse Mountain gives the illusion of a relatively small mountain, but in reality it’s at least comparable to some of the largest mountains in our world.

Assuming that you didn’t need the rode poneglyphs, a better option would be to steal a marine ship and sail through the end of the calm belt. I’m sure there’s other methods we don’t know of (multiple people who travel the grand line have been able to exit it: Mihawk, Shanks, Dragon) but this is the easiest option ATM.