I've tried the rear ladders and you can climb up them more quickly than the front one due to the clearance you've got for jumping onto them, but it's still slower than the times when you can manage to get on top of the raised ledge next to the ladder.
The mobula is the only ship where engineers have to follow the most obvious route, with the exception of jumping into the wing area, back or front.
The Goldfish has fast access from balloon to hull or turning engines, the Pyramidion has fast access to the hull from the balloon and a fast way to get to the turning engines from the rear engine mezzanine ....
I mean I could go on but it'd just be repetition.