While this doesn't address Haste, one could allow alchemists, with the "General" spells to create items that allow less prep time for spells. At one extreme would be letting a General I spell take off one round of prep - that's pretty cheap, and even a General II would be inexpensive, in relative terms. At the other extreme, one could say that since the ESF for casting 1 round short is 25, you need a General V spell to fully counter that - but you still have to make an ESF roll, and if you fail, the modifier on the fumble roll is still 3*25.