There is no technique on the planet (lightening or not! ) that can allow you to play an arpeggio legato over a couple of octaves... with one hand.

As I said, the only way not using a sustain pedal works is to NEVER play anything that NEEDS a sustain pedal. Which is about 60% of everything. If you are happy with 40%, you are good to go. Some make do with 10%...