I recently had this done on my '19 Redeye, Hemituner and Barth both offer this service.
You don't need a Demon PCM or center stack, you just need your PCM unlocked and tuned by them, they include steering wheel buttons that you use to turn the HO mode on, you also get the Demon drag mode settings with this modification.
It's only available for '18-'20 cars if I remember correctly, I might be wrong on 2020 cars but it is available for '18-'19 for sure.