You don't have to recover it all the way in one step , first track down the owners , see if you can settle on a price ? buy it! then get it from its current location to a secure place. you now have time to get the other parts of the journey sorted out.
brilliant idea of getting the media/military involved ,but only after you have a bill of sale in your pocket , all sorts of people crawl out of the woodwork wanting to spoil your fun.
trucking firms , barge operators all want free advertising , some may be enthusiasts and want to be involved just because its interesting , if you have time you can wait for a back load where the vehicle will be travelling empty back from a paying job, you may be able to negotiate a good price .
media coverage is always good , if your name and contact number are displayed other vehicles and parts , interesting stuff may be offered to you (all sorts of things are tucked away and forgotten about)
If you are looking for volunteers I am almost tempted to come over the ditch and give you a hand just for the fun of it.