I can't make a block act like a ladder

You can add an event result that executes a few commands, or simply give the player levitation. I do not know if you can make a block that changes its attach face, but you could make a levitation pad, or make the block non-colideable so that they can ride through it. If you need/want help with this, respond below. 

You can take the code from the ladder, copy paste it and then adjust the code to your likings. As for the attach face, Napuroo did a great tutorial for rotation here; https://mcreator.net/forum/31093/how-make-rotatable-block-video-tutorial