Damn load bearing wall.. WWJD.

looks good...hopefully no kitchen cabinets are screwed to the studs to be removed

 

cut the drywall back a bit further to the left and add a cripple to carry a new header at the next common stud , cut the cripple so the header will be at the same height as the underside of that existing one , cut the existing header flush to the left side of the infill stud you have under it , add a king stud to that infill stud making that a king / cripple for the now shortened existing header , add a cripple to the left side of the new king stud so it is a cripple / king / cripple . Install a new header from there to the cripple you added to the left

you dig ?

 

My kitchen didn't have the ex-door opening but it was an internal load bearing wall (older home, hand framed roof structure.) I went with a 4 by 10 duct up through the back of the cabinet above the microwave when then 8 inch round in the attic. That then runs up to a dedicated vent in the roof. I agree, it is MUCH better than venting your microwave into the kitchen. I didn't even have to replace the microwave, it was designed to be vented either way.

While up there I was impressed by the skill of the old time builder. That hand framed roof is a work of hidden art.

 

It took me three or four passes through your suggestion, but now I got it! Much appreciated.