One of the more "probable" and more or less energy sane suggestions would be using mass drivers to eject the atmosphere at high speeds to induce spin.
The mass of the venusian atmosphere is high enough for this to actually work and still leave you a lot of atmosphere to work with, it will take 20-30 years but it still doable.
And pointing those canisters at Mars or the moon. Once you've hit Venusian escape velocity you might as well move that atmosphere somewhere else that needs it.
But compressing acidic gasses makes the corrosion problem worse, doesn't it? How do you deal with that?
The mass of the venusian atmosphere is high enough for this to actually work and still leave you a lot of atmosphere to work with, it will take 20-30 years but it still doable.