after reading more about the subject i come to the conclusion that dice rolling is better even if i dont use fair dice.
It is faster, and most likely sufficient if rolled enough.
Am i thinking correct?
Yes, if you roll it 100 times, then even if it seems completely biased towards 1, it will generate enough entropy. That's the Shannon equation for measuring uncertainty.
I have demonstrated in
here. The probability of a number being 50%, and the rest 5 being 10% each, still gives 2.16 bits of entropy on each roll, which is 0.42 less than in a completely unbiased dice, but enough nevertheless if you simply roll it a few times more.
It simply takes time to verify that the dice won't fare worse than that. In contrast, coin flipping using von Neumann's method necessitates no precautionary measures.