Yes, those components look OK - the problem may be creating a gap for the hall device,
cutting ferrite is difficult (diamond wheel will do it).
Or you can add the hall sensor on one side and a piece of iron on the other.
You also need to calibrate it - the mechanical dimension of the gap the hall
sensor fits in is crucial as the magnetic flux depends on it and the current.
A CT has the advantage that the magnetic circuit is not crucial and there is
no gap to worry about.