Can a non-loadbearing decorative chest high wall be removed and replaced with railings without scaffolding?

Perhaps safety projection hoarding from neighbour below for falling debris. And men working from harnesses. Risk Assessments and safe method of demolition/ works required.

This is an option you could consider,its a bit unorthodox and really depends on the exact construction of your existing balcony wall and other factors,you could: Get some 8ft x 4ft x 25mm thick marine ply sheet. Bolt a sheet to the outside of your balcony wall lengthways using threaded bar or nuts and bolts secured through pre drilled holes in your existing wall. When the sheet is in place it would provide some edge protection and provided the wall you are demolishing is less than 4 foot high will also prevent rubble falling below. If the sheet is bolted/ secured through at approx 12ins from the sheet ends, you should using a petrol disc cutter be able to cut out a 6ft wide section of wall between the securing bolts into manageable pieces for removal. When the section of wall is removed you could fit a 6ft wide section of railing ,and then refit the ply board secured to the next section of wall and to the newly fitted section of railings and repeat the process. You would have to fit a securing/safety line to the plyboard and strong anchorage point whilst fitting to prevent it accidentally falling and workers would have to wear harnesses with restraint lanyards fitted again secured to an appropriate anchorage point.