I just bought the Lyens brushless sensorless controller, and it's a cadilac of a controller. You have no hall wires in a WE kit unless it is very old, so you have to find a brushless sensorless controller, sometimes called pedal first.
But of the less expensive sensorless controllers the Aotema/ Wilderness Energy one is actually one of the better ones. So don't go for the crystalyte one if you want an improvement. Lyens can build you his controller for any voltage you want but the 45 amps vs 22 will blow your batteries a lot faster. Most likely he can set the amps lower too if you want. At 36v 30 amps, that controller would stay cool forever.
If you live in the US get your stock aotema controller from High Tech Bikes.