I don't think you understand.

The Steemit stake has been removed. It is now almost impossible to get >50% of HP.

Also, as promosed after the split, with the next hardfork it will take 30 days after powering up to be able to vote for witnesses. This will prevent exchanges from being able to do it quickly.

Therefore we eliminated the threat that allowed over 100 million SP (like 30% of all Steem) to be used to vote.

So it is extremely unlikely to get >50%. Also, if we get that much, there is serious trouble anyway because the votes are split somewhat evenly.

However, it is still very possible to get 20%.

Do you have another reason for wanting to tinker?