Extra Masters before PhD
No, given everything else you say, no one will give it a moment's thought. You've been on a steady path and seem to be a success at it. 

And, almost any other option will be worse. A different doctorate would shorten your time to completion, but, as you say, this one gives you opportunities. 

People will look primarily to your most recent accomplishments in any case. It is just how it works. 

Just. Do. It.