Possible to add gears to Epik Lite?

[Smerd11]

Hi all, I'm about ready to pull the trigger and get an e-Joe bike. Main use is for commuting about three miles to and from work, though I'll also use it to ride around town (finally freeing me from the unwieldy local bikeshare bikes). I'm drawn to the simplicity and slightly lower weight of the Epik Lite, but I worry that I might find myself wanting gears down the line. Am I right that it would be possible to simply add gears to the Epik Lite later on if I decide I need it? What all would I need to purchase and add on--derailer, shifter, cassette? Thanks for the help!