Angel Tarragon
Dawn Dragon
My gripe is this: why waste a feat to alter a spell to make it inferior? Feats exist to improve a character and their abilities. I think your idea would work but make it like inverting school specialization. Take evocation for example: all spells cast from the evocation school could be minimized and the spells from its opposing school could be be altered to allow the spellcaster to learn those spells with a metamagic feat that increases their level by two, without actually having to increase their level.