You're welcome. So we don't have to go to Fangorn Forest proper, unless we want to. Isengard is enough of a diversion, and we'd meet both Radagast and Treebeard there. The South Road would lead directly to Edoras and beyond. Fangorn itself is up to the northeast, close enough to be seen as we come in through the Gap of Rohan. But we can play it by ear like we've always done.
And Sid, I don't think anything contradicts your post, as the trees of ISengard do have the Ents in it. I don't know if the Huorns are around, they'd be back in the darkest dales of Fangorn Forest proper, and you'd be intercepted by Ents before you stumbled into those dark places for your safety.