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golgol-
It's a fun problem to think about, every time you rightly decide it can't be done you get sucked back in again thinking there might be a way. It can make a difference if you happen to have a proper lighting circuit live in there but that's unusual in the hallway lighting.
I had a naughty solution in my house that I eventually sorted out. Ran a line from a socket on the other side of the wall. That's not a recommendation, I used to lose some sleep over it from time to time.
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In your previous post, the second diagram has 3core +earth dropping down to the switch. The extra conductor would make it possible, but without it your stuck.
Smart bulb /motion sensor switched?
Pull through another cable?
Move house?
Airhead
user69121
If I'm reading this right you are trying to get a constant live feed from a hallway light circuit which is 2 way. It doesn't work because the live on the hallway circuit changes when the other light switch in the hallway is operated. In other words either the Line or the Strapper could be the live you want for the outside light but not at the same time.
In short you need to get a live from the lighting circuit to the outside light or give up 2 way switching in the hallway. Do spend 5 or so years lying in bed at night trying to work out an alternative though, it's a useful way of avoiding sleepless nights :)