Your starting point of creating a structural hanging point while not affecting the decor makes this project probably impossible.
If you really want to head in this direction then you could start by buying whatever pole you think is suitable. Stand/clamp it across some blocks outside and stand in the middle, see what happens. I suspect you'll find out it's not going to be a good idea, if so take it to the tip for recycling and think again.
If you then decide this is a good idea then you'll need some suitable load-rated brackets, together with huge holes, bolts and chemical anchors. Definitely not some B&Q brackets, screws and red wall plugs in case that was what you had in mind.
Hopefully you'll be above the lintel on the left, you should check first though. Perhaps chip some plaster off or look into the cavity with an endoscope.
All only if the wall is not lightweight block and continues upstairs so has substantial weight resting on its top. If either wall ends at the ceiling then forget it, it would just fall apart, before or shortly after attaching it.
If you really want to head in this direction then you could start by buying whatever pole you think is suitable. Stand/clamp it across some blocks outside and stand in the middle, see what happens. I suspect you'll find out it's not going to be a good idea, if so take it to the tip for recycling and think again.
If you then decide this is a good idea then you'll need some suitable load-rated brackets, together with huge holes, bolts and chemical anchors. Definitely not some B&Q brackets, screws and red wall plugs in case that was what you had in mind.
Hopefully you'll be above the lintel on the left, you should check first though. Perhaps chip some plaster off or look into the cavity with an endoscope.
All only if the wall is not lightweight block and continues upstairs so has substantial weight resting on its top. If either wall ends at the ceiling then forget it, it would just fall apart, before or shortly after attaching it.

