How useable is your 'emergency tiller' arrangement? On some wheel-steered boats these are difficult to use effectively with the binnacle in place. If your standby tiller is OK to use, maybe get yourself home that way and deal with the issue when you get back.
View Boat Photos - YachtWorld.com
Looking at Photo #3 here it looks like there's a reasonable distance between the rudder post (under the cover at the aft end of the cockpit seating) and the wheel to allow use of a tiller. By rights the boat will have one sitting somewhere below, perhaps forgotten.
Otherwise you're stuck with Denise's plan (not a bad one) to fix it all before the trip - providing you'll have the parts, tools and time to do so.