It is possible to add more level 2 chargers. The Brusa 3.3 kW charger has been done with I think up to 3 extra add ons. So depending on which charger you have that gives you 13.3-16.5 kW. Then you have to find a source that can supply that amount of power. A Tesla high power unit does but then you need an adapter to the J1772. I think it's also possible to use 2 or more different J1772 but then you take up multiple units if you are charging in public.
Anyways the real point this all leads to is cost, it's super expensive, at least $2500 per unit, maybe more plus a Tesla adapter if you go that route and it still doesn't get you to half the speed of the QC. The best route is to trade your car in on one that has it.
