I nearly always use the helicopter rig as shown with leadcore and a method feeder.
I would never tie a hook on the very end, but I have sometimes attached a stringer.

The hooklength is tied to suit the situation and attached to the ring swivel via the clip, in the usual way.

I always try to use a hooklength material weaker than the main line.

The leadcore is tied directly to the main line with a palomar knot, which is a bit awkward to tie, but I trust the palomar knot completely.

Below the ring swivel is a buffer bead and above it is a float rubber or a piece of bicycle inner tube, pierced through by the leadcore, not just threaded on.

Both are weak but stay in place when casting, so the hooklength won’t slide up the leadcore, though I have never wanted to cast this rig very far.

Two float rubbers can be used if needed for longer casting. The inner tube stays in place better than the float rubber. The inner tube can be quite tight, although nowhere near as tight as the beads some tackle companies recommend. It is easily loosened, if required, by sliding it up and down the leadcore.

The main point is that if the main line breaks, the hooklength can very easily escape from the leadcore.

Even a small greedy roach or rudd would not be tethered.

I have never had the knot break at the leadcore, but I have had the feeder fall to bits, or the hooklength break. The feeder often escapes intact, I presume because of its teardrop shape.