Custom p59 os for 1uz conversion

Hi guys, new to the forum and hope everyone is well! I need some help with my project, I own a 1uz ls400 that I'm in the process of converting to a gm p59 ecu with iac and coil on plugs. I've been looking into a p59 modified os allowing 2 ve tables? Not sure if it's a real thing but would really like the ability to have the extra resolution for tuning as I may go boosted and it will be a daily driver so the off boost and on boost resolution would be handy plus I will have to start from scratch anyway given the nature of my swap. Would love to get as much help as possible if I can :) I'm hoping to achieve an awesome ecu worth the conversion than can do as much as possible.