You want to start New Game+ with a specific set of gear unlocked by a late-game quest. You can quickly complete the prerequisite quests on a test save, craft the gear, then start NG+.
This prints every active fact for that quest to your console log, allowing you to see exactly which stages are incomplete. witcher 3 complete quest console command
If the quest you need isn't listed above, you have to find the specific "fact" name used by the game's engine: You want to start New Game+ with a
: Type your specific addfact command and hit Enter. Note that commands are case-sensitive . Common Quest IDs craft the gear