As google intended to fix the launcher customization from the outset, and only implented the "stock only" restriction on gestures as a stopgap solution, I think it's fair to expect such fixes to make their way to the phones of other manufacturers.
As I have understood it, as google releases new versions of android they become available for manufacturers as well, and it is on them to implement later versions into updates for their devices. I'd wager that can take more or less work, depending on what is changing, but leaving us without this and other improvements would be sad. I know it can't happen immediately, but we should expect it eventually.
With this added, the ZF6 would be the first perfect phone for me that I've had in a while.