[noduerme]

I'm not sure that would be possible. These are both just ways of problem-solving the gradient of diffusion of random bit noise once it's blown up to a larger size. The Simplex method appears a lot more prone to volatility. The peaks and valleys are more extreme given the same parameters. Crushing the peaks and valleys would lead to compression artifacts or else lengthening the frequency to stretch out the band. Maybe I'm wrong, but fundamentally the fastest way would be to reproduce the underlying noise and then re-render it in the other method.