Obstacle avoidance Mavlink message from GCS

Hello,

So I haven’t enabled proximity sensors in my firmware and I intend to use our own method of point cloud computation on the GCS as a substitute for the Intel Realsense (or a front facing LiDAR) and then send the OBSTACLE_DISTANCE message. Would this work or should I enable MAVLink proximity sensors?

PS: Can anyone also tell me which leads to better performance: T265 or LiDAR?

Thanks