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Is the access problem an immovable object or a property boundary?
If it's the latter a nice chat with the neighbour to see if you can take down any obstacles and then re-enstate them.
If it's the former how accurate is the 700mm measurement? MiTowers have a 730mm x 1320 footprint could you squeeze one of them in they're rated for 1 person + tools etc but are very good, safe towers ideal for working in smaller spaces. You may be able to squeeze one in.
One of the reasons our building works quotes are delayed is that we need the pointing on the side return looked at. This needs a scaffold/tower. However, the access is only 700mm wide and regular towers are apparently 850mm. Anyone come across/worked around similar?