Heating installation, Mobilize Duo heating system retrofit in Twizy

Hello,

I don't have a Twizy, but am seriously considering getting one. One of the major things holding me back a bit is the lack of a heating system, since I live in a fairly cold climate in Norway.
Has anyone looked into the possibility of a retrofit of the heating system in the Mobilize Duo?

Does anyone know the specifications of the Mobilize Duo:
- 12V battery
- DC-DC converter
- Heater
?

Maybe the Mobilize Duo system isn't the most future proof system since they have been discontinued, but I assume the same components would need upgrading (12V battery and DC-DC converter) if an electric heater could be installed.

Kind regards,
Hans Marius