Higher capacity battery mod?

I like the enthusiasm and ingenuity shown, only question I have, since I'm interested in refueling my old hybrid motor what are you looking at for return on investment ROI or your budget constraints.

 

For me.. my goal of 100mile range on EV mode while being able to drive up to 80mph in EV mode like the Gen 4 Prime was my baseline. This in theory should allow me 24 hours easy of not needing to have ICE come on while out boondocking in the middle of where ever I am, while being fully powered up using everything from air fryer to keeping my server and gaming pc running and its various networking devices along with fridge running.
The thought that id have two 150ah 12V lithium batteries along side a roughly 50kWh HV battery should get me there. Finally, the extra capacity HV battery would provide enough juice when fully charged to propel the rear Electric engine that made the car AWD faster than a non dual motor baby tesla... so the Prius wins in a stop light street race up to 79mph.