1540ft. So we are now at 1900ft (350ft-odd high)
Your calculations are seriously OFF, it was calcuted before, it is not 1540 but 1740 instead, this is how high you would be crossing the bridge shooting the ordinary ILS to 28L, so at 1900 you are only 160 ft higher, nothing that even a rookie commercial pilot could not handle. From the bridge it is 5.4 nm to the touchdown zone and the GS is at 3 deg. and the trigonometry is very easy. Also the Asiana 777 crew was nowhere near 1900' when crossing the bridge, they were at about 2400'
so the system did not 'set them up', if there was any 'set up' here it was of their own making. Also your assumption about stability at 1000 ft is wrong, in VMC you can get stable as far down as 500 feet. Lets dispell any myth that this was a difficult approach, comparing with what's out there in the world of aviation it doesn't even qualify as a moderately difficult approach.