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Now for the fly in the ointment.
All load bearing walls follow a load path down to the foundation. If your closet door is becoming larger so more load is being carried by the new header, The new bearing points in which support
You do not say what state you live in, but I know of no state that allows this type of work without a permit. I would suggest at least you get an engineer report on design and header size to handle the new load presented both on it and the footings or supports below.
You want to be safe and having an issue after you removed the existing beam is not where you want to find yourself at.