peeling black eyed peas for acaraje (fritters)
It seems that there are specific machines for de-hulling beans; that'd be the easiest way.

Other than that you should soak for 24h, the beans will expand and rip the hulls more easily, but I suppose you still have to peel them by hand - Most of the time I've seen people making acarajé they peel it one by one...

The traditional acarajé is made without the shell, some say the shell will make it bitter. Honestly, it's a ton of work to peel it one by one, I'd give it a try with the shell and compare.