Okay, so here's what I did:

I completely dropped the idea of using FTL at all. I only needed a way to switch leaders quickly and I found it best to just use macros. I did what I described above, Using the keys "Page Up", "Page Down", "Home", "End", and "-". Each key was assigned to focus on one character, and when pressed, all characters (minus the one that I wanted to be leader) would target and focus on the character I wanted to make as leader of the group. I then switch windows to my new leader, press my follow macro, and continue on as normal. This works perfectly for me, as its not an overly complicated setup. The macro I used is as follows:

/target "InsertCharacterName"
/focus target