There is no one working on ipq50xx so far, and quite a lot of very basic and fundamental kernel support is missing for this SOC, I wouldn't see that changing anytime soon either.
Have a look at (supported-) ipq807x based devices instead, which aren't necessarily more expensive (e.g. the Dynalink DL-WRX36 is even ~35% cheaper than the ax6000), but are working - now.