Change from 110 volts to 220 volts

I have a US Roadster that I'd like to modify so it becomes like the European Roadster in that way that it charges at 220-240 Volts when no pilot signal is present. Any idea how to modify the car to archive this (my warranty is void)?

I'm using the MC240 charger for now since it gives the pilot signal to charge at 220 Volts. The problem is that it is a bit big to carry around.

Thanks for the advice! Yes, it is probably a firmware issue since they changed the limit from 16 amp to 13 amp in Europe recently (my first European Roadster could at least charge at 16 amp).
I ordered a European charger from Tesla telling that I had a US car and they sent it to me, but it did not work... So why could they not just say that they could modify the firmware instead of me having to return the cable? I will ask again.

I'd like to add the pilot signal to the chargers I have (and currently cannot use) so I could choose the ampere. I see there are suggestions on how to do this on the forum, if someone that did it could sell a kit that would be great.
What J1772 charge station do you suggest?
I found this: Lincomatics DIY Blog | electronics, 3d printing, hacking, etc