It's going to bleed under from the first coat anyway. If you have spare templates I'd remove everything, wash clean with mineral spirits , dry. Reapply templates, press into place, paint a coat of white and let dry. Then the correct blue a few coats after really stirring the blue paint well.
If you don't have spare templates I'd just paint the right blue on top, let dry overnight, then remove all the masking and start cleaning with toothpicks and mineral spirits.