Windows 10 on Arm is going to run X86 from a phone like device, a device that does not exist as of yet. Microsoft has already stated the phones we have will not be upgraded, even though I'm of the belief Idol 4S, Lumia 950 and 950 XL, Elite X3 could handle this.......I am going to holdout hope it may come to pass after the guys over at XDA take a crack at it.
As of right now HP Elite X3can access X86 apps like Chrome by using the web portal Workspace. This requires the phone to be docked or attached to a big screen, and the apps run on the web and not on the phone.