I have lifted heavy moving lights to a rigging
point using static rescue rope and properly designed hardware. the rope is 11mm dia and rated to 3125kg MBS.
Using a technique called a "Z" pulley
system which gives lifting ratios of 3:1 in its native form but it can be adapted to 5:1 or 9:1 easily.
As far a bowlines go, there are a number of better hitches and bends to use that reduce the head room needed to get things higher up without the need to get a higher rigging
point.
All my systems are used in vertical rescue or industrial rope access systems and I am trained in such systems.
I would not even entertain using the rope in the link provided and ropes with thimbles for me are not to be used in this situation.
These are my thoughts and opinions.
Oh and never never never connect to a
handrail. Simply not designed to hold weight like that.
Regards
Geoff