Jesse,
Week #3 is the recovery week on the Finisher plan. Switch week # 3 and 4 and take the recovery week while you are travelling. On the PR plan week #4 is the recovery week so you can slip than in with few changes.
Training on the Finisher plan and then attempting to execute a PR race is a mismatch. It is a better plan to follow the PR plan and cut down the number of training hour by selecting passive rest instead of active recovery on the recovery days. You can also cut down training hours by shortening warm up and cool down times on interval days.
Lynda