Can't wait to see your Frankie! The boys are actually much easier to sew for. It's just I sewed the seam a bit wonky so they pucker up at the back. It won't be visible when he's displayed but I don't want it there.
FabriTac is great for split vinyl. Also, you can buy a vinyl repair kit that is meant for repairing vinyl car seats and it works like a charm, too. I've got a couple Jackson dolls half re-rooted and one's head split so I fixed it that way. I also used it to fill the piercing holes in their faces because the characters I'm turning them into don't have facial piercings