I have a shallow bilge. I have been aboard something like a dozen Ariel's, and there are several I have seen that appear to have their lead ballast encapsulated in fiberglass just like Faith does. She did Also have the lead pigs (since disposed of) but they were screwed down with heavy cleats that would not have been likely to break in a rollover.

Search the forum, look at the pictures of the bilge on various boats. If yours is not encapsulated, do whatever you need to do to sleep better at night.