Hi its possible to remove the ignition assembly which houses the steering lock. The lock is held in place with a shear held bolt but they are not always sheared.
Best of luck moving it if it has that much water inside its going to be heavy. First place to look for water ingress has to be through the doors they have a plastic membrane stuck to the door and they always fail. Take the door cards off and you will see what i mean. There are other places that water enters after all they are old cars.
Welcome to the forum. Good luck with the restoration. I believe you need a certain number of post before you can post pictures. Bbs alloys were an option for the golf they should be bbs ra's.
Don't know about most of your problems but does the horn contact on the back of the steering wheel making contact via the wheel slip ring? I presume you have checked the horn does operate if you attach a live feed.
Welcome and the best of luck with the restoration. lots of parts are remanufactured but not all. second hand parts are available some "uncommon" and expensive. Remember these cars have not been made since the 1990's.
