Wouldn't be tough at all if one has experience fishing the narrow streams in Colorado or New Mexico that are heavily brushed in. Like you said, a roll cast using a 7.5' 3wt is the rod to use in those tight quarters. Accuracy is a must.
Grew up fishing Cimarron Canyon, Eagles Nest and Red River area in NM. Nothing like lots of trees and the tranquility of the water flowing through them.