From where I'm looking that ledge looks about 3 ft wide.
How wide do you need it to be?
When I was a tumbler (circa 1968/9) if I'd expressed concern about working on a ledge that wide I would have been bombarded with shouts of "Come 'ere, give us yer 'and, I'll show yer 'ow to do it", or the favourite: "Wassamarrer wiv yer? I could ride a bike on that!"
We all worked like that.
Nobody ever fell off - we knew what we were doing.
Think about it: if that ledge were a foot off the ground and you were standing on it to clean windows, would you fall off?
If you would, you've no business being in this trade, you're a liability to yourself and everyone else.
I did it umpteen times because there was no 'Elf and Safety' dictating to professional individuals what the could or couldn't make their own decisions about.
I agree that it's different if an employer tries to force an employee to take what the employee considers to be stupid risks.
Having said all that, would I do it now? NO
But then I retire in a couple of months, I don't need to - I've done my share :
