There should be announcement if CRex24 will support this soft pork or not since this softfork is a centralized solution to unlock development funds.
There should a clear post if its safe to store PRiV on Crex24 during this process.
The rest of PRiVCY team should contact directly to Crex24 exchange and ask them that they will support the coming softfork of PRiVCY or not.
Then, the team should make a statement about the Crex24 support here for PRiVCY community.
There should be no reason that any exchange would not support a soft fork upgrade.. all the exchanges need to do is update their wallets and they shouldn't have any problems. and stuff like that is something that is usually done after a new wallet is out and working. If there was any thing such as a name change or something like that then some exchanges get a bit cranky and want to charge a new listing fee just like starting from scratch.... but wallet upgrades and bug fixes are a pretty normal thing with most coins. and really no reason an exchange would not support a wallet upgrade or anything that makes a coin more secure.