I’m not saying this is the same, but it reminded me of my neighbour asking me to paint our fences grey, because they had just painted theirs grey and decided we should too.
At first he asked nicely, i said maybe but not on my to-do list right now as many other things we were working in our home and garden.
But then he started messaging a few times a week, knocking on the door, summoning me in the street, asking when we could do it as it was making the street look untidy and he had to look at these fences from his home office window. 😂
2 years on, and we have not painted the fences, on principle 😅 btw the fences we have are just non painted ‘fence colour’ but in great condition 🤷🏻♀️
Your request is completely different, for a genuine reason and nowhere near as entitled as my neighbour- his request would have cost me time and money!
Also, I very much doubt you would start harassing your neighbour, if they say no the request.
As i said in a previous reply, perhaps a note through the door might suffice? Just so it doesn’t make them feel sort of surprised and put on the spot?
Do you speak in the street at all?
Best of luck, I hope you find a solution.