Single phase to 3 phase conversion

I live in the UK and just purchased an EV Van. the van has a standards 32A 3 phase socket under the bonnet. for that I have 2 charging cables one that has a standard 3 pin plug to be used at a standard plug socket and a also a 3 phase cable for a 3 phase power supply. At home i have 240v single phase only.
Any suggestions how to convert single phase to 3 phase hence accelerating the charging process? also I am thinking of adding an on-board generator in case of emergencies or as a range extender. diesel would be preferred as the cabin heater utilises diesel therefore I can utilise that tank to save on space etc.