Same with voltage drop. If a circuit length already exceeds the theoretical VD limit (fairly common for ring finals in older houses), but the owner wants a new socket installed (usually in a place where they're running an extension lead to anyway), I just go ahead and fit it. I know it's going to be fine regarding VD.
The OP's situation is the sort of thing I would encounter, and I would try to find a way to make it work for the customer if I could, as long as I was happy that there was no danger in it.