Weep holes neighbours

Hello,

I’m sure this is a popular question and I’ve found it on many other forums but have struggled to find an answer so I’m asking it here.

My house is higher up then my neighbours and a retaining wall between my concrete path and there garage wall (my boundary wall) because of this I have a 300mm gap between neighbours house and my concrete path. Water pools up in that gap and because they are lower down water can get into neighbours weep holes. I want to fill it with crush rock and raise weep holes higher. Is this possible?

My only other option is dig down further and out a drain the length on neighbours garage. But then I’ll have this ugly trench between my neighbours wall and my concrete path.

What’s the best way to go about this that won’t compromise the structural integrity of my neighbours wall and that does comply with the standards?

(Victoria, Australia)

Thank you