Recently, I have been working on adapting the electric motor to the MX-3's manual transmission. I have decided to go without a clutch, direct driving the transmission input shaft with a simple coupler. Shifting gears may be slightly more difficult without a clutch, but since the electric motor will have much less rotational inertia than the engine it is replacing, it will be doable with a bit of practice.
I started by adding some strength to the mounting configuration of the electric motor. You can see in the picture that there are only three tiny 5/16" threaded holes at the edge of the motor face for mounting stuff to this side of the motor: