Aircraft, especially supersonic ones, do not scale very well. The full aircraft will basically have to be complete redesign.
Main issues with supersonic aircraft, if you do manage to design and build them:
- Finding airports that are not limited in any way by noise constraints and runway capacity. These are generally not the airports rich people want to fly to to save a few hours on travel time.
- Limited range due 2-3 times higher drag (~fuel consumption per unit of distance).
- High thrust requirement due to 2-3 times higher drag.
- Limited market size due to high costs and limited range.
- Finding an engine supplier for a limited number of aircraft (high development costs).