Yes, you can run a remote throttle/gear shift. The steering bracket is obviously necessary to run and steer it remotely.
In my opinion, an electric mark 25, while a desirable motor, is not worth that kind of money. Even if it can be demonstrated to run, without the tiller handle it’s just too high.
Now if it’s in immaculate shape and has really nice paint and HAD a functional tiller handle then to the right buyer the asking price may be getting more realistic. Just my opinion but even with all that, 750 is still too high.
Scott