This is very interesting. I am a volunteer with MIA Recovery Network and I have helped to find families in similar situations, the latest being the Tokyo Prison Fire casualties who are buried as unknowns in Manila. DPAA has finally agreed to pursue identification only after a descendent (with my help) found family members for 60% of the total casualties, missing and identified.
I do know that DPAA has been working on identifications but I did not know that they sanctioned finding families for the USS Arizona.
What they are looking for is DNA from a family member to add to their database to help with identification. Ultimately, they would love to have DNA from the family of every MIA.
What I have done with cases I have helped with, is to make up a wikitree profile for the MIA and add as much info as possible in the hopes of being contacted by a family member when I have a difficult case.
Always note at the bottom of the profile, in italics, that the person is listed as missing and I list the place and date as well as where the person is memorialized.
I then take that info and add it to the profiles of family members, with a link to the MIA so that someone reading the profile can easily click and find the profile.
Do you have a list of names that you are working with?
Also, it should be made clear that the DNA collected is never shared publicly. The test is strictly for the database for possible identification.