I like Philomena, and I like it spelled that way. I think it works as a middle name for Veronica, but as both names are quite long it might sound a bit too elaborate or clunky.
I love it! It's so sweet. That's my favorite spelling of it, although Philomina seems pretty natural, too.VeronicaPhilomena is alright. I don't mind the -a endings, but they have the same amount of syllables so it feels too matchy.
PHILOMENA IS ONE OF MY FAVORITE NAMES! It's so pretty! And I like it spelled just that way: Philomena. And I do NOT think it works as a middle name for Veronica. Too many "-a" endings. VeronicaPhilomena... though it could grow on me. PhilomenaVeronica... hmmm...