Howdy Mr. W, welcome and nice work.
I hope you don't mind a question from the the cheap seats, but from what you are saying, all the dwarf stars mentioned formed normally for their types and where then were stripped down to thier present layer by unknown and/or differing forces?
So, in even lower numbers, should there be oxygen or even carbon atmosphere dwarf stars?
Or would the process of stripping the dwarf star down that far simply disrupt it all together?
Time wasted having fun is not time wasted - Lennon
(John, not the other one.)