Sony announced today you can now change your online ID. They have noted that users may experience loss of game progress, in game content and leaderboard stats. There was a list of games that listed whether or not issues were expected, however H1Z1 was unlisted. Please report your experience below if you've made the ID change. Thanks!
I changed my psn ID and have not noticed any kind of issues apart from the in-game leaderboards still showing the old ID, but its still showing the correct amount of kills and wins tho. The career leaderboard in the menu is showing my new ID with correct stats. I was a bit nervous changing it but there doesnt seem to be any problems by doing so.