Don't sweat the ladder/ramp thing.  I raise a heavy breed of large fowl.  My roosts are not very high up, but I had to treat one of my big roosters for bumblefoot.  I decided to put in a ramp for them to get on, and off the roosts easier.  Keep in mind, these are fully grown birds, not youngsters.
For the first couple nights, they would not even go into the coop with the monster that was going to eat them.  It was summer, the run is enclosed, so not a big deal.  For 2 days, I would put each one on the monster that was going to eat them, and while holding them with my hands, walk them up, and down the ramp a couple times.  On the third night, they decided that they might live if they ran real fast past the monster that would eat them, and jump up onto their roost.  A couple more times, I put the rooster on the monster that would eat them, walking him up, and down the ramp.  I figured the hens would probably follow him.  For the rest of the week, they ran past the monster that would eat them, jumped up on their roost, and lived. 
At that point, I didn't care if they used the ramp, or not.  I stopped trying to coax them, or train them to use it.  About 3 days later, when I went out to feed them, lo and behold the rooster walked up the ramp onto the roost, followed by a hen.  They stood on the roost to watch me.  The following day, they were all using the ramp.