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I’m aware of it, but haven’t tried it. There are hobbyists using chording already (this is how stenographers type so fast, combined with shorthand) so the idea isn’t new. The innovation here would be the directional movements in replacing traditional keypresses. I’d give it a go. I suspect the learning curve to be really steep though!
OP is in EU, but here in the US property owners do not have rights to airspace.
However, spying with cameras or nuisance noise would be reasons for legal action.