Yup, had a friend that talked about doing this before i got into printing - I live 30 min. from the Aleph Objects facility in Loveland, CO, so Lulzbots are popular around here.
He used this adapter - https://www.thingiverse.com/thing:1523837
and the stock motor that came with the default extruder.
Firmware is another issue, but IIRC, he flashed Marlin to the board, and there are several people on the Lulzbot forums that have done similar mods, so the knowledge is definitely out there.