Not me but I know 3 mates from various training routes who were cabin crew and now are doing RHS.
One was working for BA crew and did modular training in her spare time. Then got hired by BA for 737 and is now on the 744.
Another mate was working for Monarch, went to OAT, then got hired by Jet2 in 2004.
The last was working for Virgin, quit, went to Cabair, then put himself through the ATP scheme at CTC and now works for Easy.