not by the cartel of mining pools or some central committee of hash-providers at their sole discretion
You need some miners on your side. Otherwise, you have to subtract that hashrate from your calculations. If you introduce a change, which is ignored by 99% miners, and you reject their blocks, then your chain will be much slower. And the speed of BIP-110 chain can be easily measured by counting signalling blocks, because after block number 961,632, your client will reject all non-signalling blocks, even if 99% hashrate will keep making them.
You can always change the code, but you cannot force people to mine your chain. If you manage a company, and fire 99% employees, then you have to do their job by yourself.