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You can use a `zipTree` as sync source, so yes, should work fine

I can't seem to figure out how to specify the subdirectory within the zip file as the 'from' component of the Copy task.

zipTree returns a FileTree, but I can't seem to see how get a sub-tree from it.

You don't get a subtree, you use includes and excludes

Yes, but the point is, those includes/excludes only tell me which files should be copied over. It does not prevent the parent directory from being included.

so if my zip file has a structure like ...

dir1
|- dir2
`- dir3

... the directory structure is still preserved, instead of just copying dir2 and dir3 to the destination directory like I want it to.

For that you can manipulate the path on the fly, but I don't have in mind how and am on mobile. Something like `eachFile { it.relativePath = ... }`