Yes, corporate free speech simplifies campaign finance law, because there is less work and paperwork to keep track of. The fewer laws there are to apply, the less oversight needs to happen. This is true in corporate speech, because no one is making sure that they have not reached their limits of free speech.
Yes, corporate free speech simplifies campaign finance law, because there is no limit to the amount of spending by a corporation. Any attempt to limit campaign financing will infringe on someone's rights of free speech. It is better to have an open system, where anyone can spend what they want to on a candidate's election.