Adding onto this thread, will I score enough Gil to switch weapons in Chapters 11 and 12?

I've already levelled the Gladius to Helter-Skelter, around level 22, I think, and the Pearlwing Staff to level 24, not having realized that the EXP cost for their further development dramatically increases. I suspected that the EXP for each weapon would escalate according to that at its base level, which was entirely false. The Marlboro Wand (the one after the Pearlwing Staff) costs way less to level than the Brightwing Staff, the Gladius is also expensive, and there are better weapons options, assuming that it isn't too difficult to get the Lionheart, for each character. I also levelled the Bladed Lance to 21, thinking that I just wasn't going to have the Gil for the Pandoran Spear, but it is also cheaper to level the Glaive than the Bladed Lance's upgrade.

I don't plan on farming for any Gil in this game and would like to know if I've invested too much in this to switch now. I figure that, if I get to a point in the game where I do actually score some Gil, I can upgrade them, sell them, and make the chosen weapons that I desire, but don't know that I actually will.