I hope that by clearing the spinner you mean getting 300 hit on it, then eventually halving bonus score. However, if you mean losing more health, there will be a huge problem here.
There are maps (especially while playing with HardRock mod), where to pass you would need to spin well over 420-450, which not many people can do. Then, there are maps like
Humanoid - MENDES [Another], which practically can't be passed with HR, because of huge HP drain and spinning being capped at 477 rpm.
Well, we don't even need to go over 400 rpm. There are endless maps, where spinning for like 240-250 will bring you from full HP to below half of it. If you double the drain on these spinners, then even if you was to spin almost twice as fast and replenish almost twice HP this way, you will die anyway.
But if you mean only passing the spinner as 300 hit, then eventually some modification to the bonus score, then why not
However, it would probably require to be either unranked mod, or the mod to be completely neglected, while counting towards your ranked scores. This would probably need to either keep evaluating and saving score difference that which would appear during spinning, then adjust the submitted score accordingly, or to calculate simultanously your normal score and current score with this mod. I suppose the first option could be better?