Contemplating towing

Those d'shaft disconnects are love/hate. People've used them for years and been pleased. Others can't stand them. I haven't had one but from what I read, a good deal of trouble stems from a less-than-perfect install of the cable that does the release/engage. But there've also been issues with road debris, like pieces of gravel, getting into the mechanism. Fair amount of talk about having to go under and free it, lube it or clean it. If you're towing a pickup truck, you can maybe get under enough to accomplish that. Crown Vic is going to be too low to get any access.
There should be plenty of used driveshafts for that car. I'd suggest getting one, reconditioning it, and installing the disconnect in it. Then you have an easy fallback if the disconnect has to be worked on.