[newlite4]

For this sort of job, I have always favoured Abrafile tension files that fit into a hacksaw frame. Just one hole to feed the file through fit into the frame and file in any direction within the scribed marks, clean up with standard files afterwards.
The downside is that Abrafile blades have not been made for twenty years or more but modern tile cutting blades are very similar and fit into junior hacksaw frames.
Neil