Please keep Ruthie Henshall out of it. Personally, I am not a fan of her voice, and think her elphie would sound old. They'd probably have to change the key for her, as well.
Why not revive Linzi Hately's career by putting her as Elphaba. either her or Frances Ruffelle.
As for a recording - if they add new music, or make some changes, most likely there will be a recording. If it remains the same as B'way, it probably won't get recorded.
"Do you know what pledge time is, Andrew"? said the PBS Executive.
"Yes", Lloyd Webber replied. "My 50th birthday special must be one program that gets done a lot."
"No", mused the man from PBS heedlessy. "Not so much. Our Stephen Sondheim Carnegie Hall concert. That's a big one."
Spoons, forks and knives seemed suddenly to suspend their motion in horror, all around the table.