Can you show us the official line on what kind of dead Jews can be baptised and which ones can't? (not your opinion, the official position)
Of course. But as I recall, you won't accept it because your personal definition of official is restricted to the scriptures only.
Determining Which Names to Submit
You are responsible to submit names of the following individuals for temple work (the individuals must have been deceased for at least one year):
•Immediate family members.
•Direct-line ancestors (parents, grandparents, great-grandparents, and so on, and their families).
You may also submit the names of the following individuals who have been deceased for at least one year:
•Biological, adoptive, and foster family lines connected to your family.
•Collateral family lines (uncles, aunts, cousins, and their families).
•Your own descendants.
•Possible ancestors, meaning individuals who have a probable family relationship that cannot be verified because the records are inadequate, such as those who have the same last name and resided in the same area as your known ancestors.
Do not submit the names of persons who are not related to you, including names of famous people or names gathered from unapproved extraction projects, such as victims of the Jewish Holocaust.
You may submit the names of individuals with whom you shared a friendship. This is an exception to the general rule that members should not submit the names of individuals to whom they are not related. Before performing ordinances for a deceased individual who was a friend, you should obtain permission from the individual’s closest living relative.
"Chapter 7: Providing Temple Ordinances," Member’s Guide to Temple and Family History Work, (2009)
As you can plainly see, this reflects the fact that that the Church has never agreed to not do proxy work for Jews of any sort if such is an ancestor of the submitter.