Comment by numpad0

What if you built a wheeled carriage to go over your desk?

Something made of precisely cut 2x4 lumber or 2040 frames, assembled like a whiteboard frame but have just a single beam where the board would be. Then the pole of monitor arm can be bolted onto the beam to hang upside down.

Once assembled, the whole thing can be rolled in and up to the front edge of the desk, right up to your face. If someone else needs to use your computer, the carriage can probably be moved back towards the wall.

The reason why display arms extend only so far is because a long cantilevered weight love to wreck the base. The desk top is going to break if it's too far out. So stretching the arm is probably no go.