Well I went to flight centre this morning and spoke to the manager there. She said there was a possibility that when rerouting I'd be hit with the price increase anyway, however I very much doubt this is so. Anyway, she said that she'd work through my "complex" itinary, and as long as I paid by the end of Friday, I'd get the lower price.

My advice is to book whatever itinary you can. Basically you can't lose since rerouting will either be free or usd75 at the most, which are both less than the price increase. If upon rerouting you did have to pay the increased fare you still will have lost nothing. If worst came to worst you could just cancel - there are no cancellation fees for the fare per se although your travel agent may charge you cancellation fees.