Thanks Luddite. Yes, I’ve read that post previously but it doesn’t really answer my question.
The 0.3% improvement mentioned is solely due to the reduction in mass, a three hundredth of the weight of bike and rider. It completely ignores rotational effects.
https://en.m.wikipedia.org/wiki/Newton's_laws_of_motion
It should be possible for me to get my remaining brain cells to quantify the change, I was just hoping someone had already done it!