Tricy Inline Add / Event Processing

Hello, all. Using PHP Runner 6.0.
I've got a list page (call this for "Table A") that shows three fields, one of which is a person's name field. The problem with names, though, is I need to be able to handle multiple possible names for someone (i.e., Real Name, Nickname, etc.). So I've got a separate table ("Table B") with a master name number, and multiple name possibilities for each name. When I do the list page for "Table A", I've got a "Before Display" function that does a lookup for that master record number in "Table B" and turns that into a name - simple enough for listing purposes.
The question I've got, though, is I'm using this list page to simplify adding records by doing lots of inline adds. I need to setup something that will take the name that is put into the inline add line, do a lookup for the "Table B" key column, and then write that value rather than the name. How do I do this? I'm trying to avoid using the "Add record" page as that would take forever...
Thanks!