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It may sound glib, but study the playing of guitarists such as Django Reinhart, who managed very well with a couple of fingers - the others were there, but in a similar manner to yours, worked together rather than independently.
If you're going up or down the piano playing octaves you'll need to move your arm, but you should minimize the movement as much as possible. A lot of times beginners will move their arm up much more than they need to in general when moving up or down the piano. Minimizing the movement minimizes the distance you need to move from one octave to another. As ...
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