With that investment in avionics, there's an obvious incentive to get the airframe airworthy again. I've been asked to consider approving repairs to a couple. PA 28 wings are hard to come by. With that investment, an alternative approach maybe to purchase a whole second PA-28 airplane/airframe, and swap the wing you need. There will certainly be a market for the other wing, unless you consider simply storing it as a spare for yourself. That gives you a lot more options to solve you present problem. And, if the second plane you buy is airworthy, you can fly it to your plane for the swap, which may be a lot easier than getting a ferry permit for your plane, or otherwise moving it.
I caution, from the experience I have had with this, have a good look at the other wing too, if there is corrosion on the airframe, there is more elsewhere....