Following up on their previously announced plans to implement a gacha banner without the 50/50 system, CN side has opened up applications to beta test the implementation.
From various developer comments on Bilibili, this banner is planned to be added in the next v1.8 update. As well, the gacha system is set up so that the pity counter will not reset if a non-rate-up SSR is pulled in the process, allowing for players to continue pulling towards their desired limited banner item.
You can find the application link here, but don't get your hopes up if you're playing on global - I was told that I wouldn't be able to get access, even with my Seasun connections.