My organization has an Excel membership database with a lot of data in it (name, company, induction date, rank, etc.). A lot of the data (including the email address) may be old and out of date. I plan to import that data into FF ("Master Database") on our new Wordpress website. Since it is new, obviously none of those Excel members I import into FF Master Database will be registered Wordpress members on the site yet. In fact a lot of the members in the FF Master Database may choose to never register on the site. I would like to set up a workflow where:

1. One of our members registers on our WP site with a simple email, first name, last name, password.
2. An admin reviews the registration to make they are actually a member (i.e. they are in the Master Database.)
3. The admin approves the registration when they confirm that the person is a member.
4. The admin connects the WP user registration (email, firstname, last name, password) with the FF Master Database record (company, rank, etc.) for that individual.
5. The user on first login is presented with their record from the FF Master Database and asked to update any incorrect or missing info.

Any suggestions on if this is possible and how best to implement this?