I’ve used these before with success.
https://www.amazon.com/Handle-Electric-Bicycle-Scooter-Rearview/dp/B01HNDEJS0/ref=mp_s_a_1_3?crid=3FXYXWD7X3G3I&keywords=ebike+brake+lever&qid=1685763293&sprefix=ebike+brake+leve%2Caps%2C164&sr=8-3