Third floor fire egress

I have a 4 unit, there are some bedrooms on the third floor that don't quite meet egress requirements because it's a 22' drop from the window sill instead of the maximum 20' 

I've been thinking of solutions and came up with something that I think might just work. An egress roof window would get you into the roof which could get you over to the second floor stairs, I'd have to add a few more stairs but that would be easy. 

The main question is the roof pitch, can any amount of roof pitch be part of egress? I think it's about a 2/5 pitch. I know ultimately it's up to the town / marshal