Is there any chance for our private keys getting stolen when we import them in a possible rogue BitcoinABC wallet?
Yes. And there is a chance for losing your BTC due to replay attacks.
Although it uses the Bitcoin ABC software, Bitcoin Cash seems a bit shady to me.
Most other coins I've used that forked, you only had to download the blockchain from the point of split. you didn't have to do a full sync, the drawback was you couldn't use the old tokens in the new wallet. the drawback with bitcoin ABC is the entire bitcoin blockchain is a beast. 99 gigs. it's a monster and takes several days to sync a wallet. the devs haven't devised a really fast way to sync a wallet. what they're doing now is like putting lipstick on a pig, it doesn't address the problem of painfully slow syncing. there's also another problem, alot of ISP's won't let you do that big of a download. to get around that you have to truncate the chain.