Yeah the fix looks straight forward - just pipe the result of git show [rev]:[path] into git lfs smudge into a file. The best bit? Even works if the file is not a pointer file, just returns the original file. Only awkwardness it won’t work if user doesn’t have LFS installed so would need to detect that.
n.b. untested through the plugin, I’ve just been messing around on the command line but can’t see why it wouldn’t work.