So... I'm officially a broken man.
30 orbs later...
NO RAGRETS
I'm so, so sorry.
Why would you purchase that many orbs for just one unit though? The amount you save is marginal and best and though you're set up for a while, I would've personally bought them in stages as I failed to roll the character. You don't even have to exit the summoning screen.
Also, a reminder that you spent that money to get a healer. Something almost useless outside of the training tower.
Regardless, congratulations. It's always a good feeling to get what you want even if it costs a small part of you (and your wallet) to do so.