There is no requirement to follow a SID N-1, so I wouldn't worry about that. But where does the topo. chart come in on a Perf. A operation when IMC? What you really need is the location of nav. aids vs MSA so you can work out where you can safely climb during the 4th segment. For that a radio nav. chart is a pretty reasonable device. When visual a Mk I eyeball is also a useful tool.
PM