lotrwiz said:
If I do so, will it be way too powerful without torque arms?
Do you like your teeth?
The front forks were never designed to take the loads imposed by any motor so adding some form of torque arm shouldn't even be a question. The failure mode has much bigger implications than the time/cost to fit a torque arm to the bike So just fit one.
Sure you can get away without one on a low powered motor but there is a lot of variables so much safer to just fit one.