Possible to replace charger with higher amp version?

I read the link to the Leaf Forum. I admire innovative people and their innovations. Seems like a lot of cost and effort to increase charging time, especially on the newer Leaf with the 6.6kwh charger. Based on the post above, The Prius PIP appears to be more difficult. Voiding existing warranties would be a big drawback.

 

I don't know a lot about the Leaf, but I did remember reading that some Leaf has two charging ports - one similar to ours in the PIP rated at L2 and a 2nd one that has a higher charging rate with a different connector (chademo dc quick charger L3). Doesn't this imply that the leaf charger/controller can support higher rate of charge?
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Wondering if Toyota purposely maxed out the PiP with a 3.3 kW charger instead of 6.6 kW, not out of saving a few $, but out of safety and longevity of the battery cells.

At the individual battery cell level, the PiP charges faster than most plug-ins with level 2 charging. For example, at the theoretical maximum “3.3 kW”, one has about a 90% charge at 60 minutes. By comparison, a Tesla needs a supercharger to pull off a similar feat at the individual cell level.

 

The DC port basically plugs directly into the battery when it's used - completely bypassing the onboard charger.

When people have adapted the Brusa 3.3 kW charger to the LEAF to add on to the stock 3.3 kW charger, there's two different ways of getting the additional AC power to the Brusa.

1. Tap into the existing AC lines as close to the charge port as possible. The stock charge port is rated for 32A, so this is OK (stock charger pulls up to 16A, also pulls up to 16A).
2. Add a separate plug for the Brusa. Not as convenient as then you can't charge faster on a standard J1772 plug out in the wild.

On the LEAF with option 1 above (which is the best way to do it, IMO), the LeafDD is used to control how much power the Brusa is allowed to push/pull using the following mechanisms:
1. Brusa will not output more than the stock onboard charger. This keeps the Brusa from overcharging the battery and basically lets the stock BMS remain in full control of charging.
2. Brusa will not pull more A/C current than the EVSE pilot signal indicates minus 16A. So if the EVSE only indicates 16A, for example, the Brusa is never turned on. If the EVSE indicates 20A, the Brusa will not pull more than 4A over the AC lines.
3. Brusa also shuts off power immediately if the J1772 trigger is pushed, just like the stock charger.

 

I think it would take a complete redesign, and by complete, I mean every factor would have to be properly taken into account from an engineering standpoint. This is not necessarily throwing everything out, just determining whether pumping more juice through the charging circuit would remain within operating limits, or whether it would be just leaving it to chance, not to upgrade certain components.