Not the first. The OEM Toyota 20V work that way. and I bet there are others too.

It is very easy to get a smooth map signal at idle. Most ITB set up have a mini manifold. And work like any other manifold car when the butterflys are closed.

This will also let the idle control valve work. The problem is the ports feeding the ITB's as the air speed changed going past the ports they can ether have the air blowing in to them giving a MAP of more PSI then is there. Then suddenly shift to a venturi and show a very low PSI. It can swap back and forth as the air speed changes making the map go all over the place.

The stock Alfa ports were very bad at this. I made new ports that are in line with the axle of the buterfly. this has the slowest air speed and the most constant map readings. but still I was getting some of the same affects. but as lest could be made drivable. But the Ve maps had some crazy ups and downs. And the WBO2 was working over time makeing changes when the MAP would flip from air being pushed in to a venturi.

Now if a J tube was used away from the butterflys like is used for a manometer in a flow bench it might be able to work. As the air would be blowing into the tube at all times. so at lest the reading would not be swaping from a push to a pull. but might still mess up speed-density math.