Frame swaps ain't hard if you are organized, have good small parts storage and take more digital pics than you think you will need. Have the factory parts catalog and service manual of course.

Frame repairs and mods are done all the time. Post photos of your damage. We can't read minds over the internet.

Tubular Dyna steering necks aren't difficult to neatly detach and (hack, cough) repair by welding to the rest of a donor frame. Chopper guys cut 'em free all the time to rake necks. Cut the gussets, not the tube, to detach the complete neck tube from bad frame. Cut the neckj tube, not the gussets, to remove unwanted neck from donor frame. Fit using a frame jig or have a weldor who knows his chit handle it using a digital laser level. You probably have someone with a frame jig in reasonable distance.

You can cut the old neck free with everything that doesn't interfere left in the original frame. Remove front end etc, then slice off the neck with a recip saw (or my favorite, a 6" angle grinder with cutting disks) and tease the remaining gusset pieces off with the part in a vise. Protect the VIN with aluminum tape or whatever so ya don't damage the numbers.

 

Not sure if you know this already, but your bike is titled via the frame. This is part of why Harley requires you to send the neck in for a new frame. If you build your bike in a new frame, you will also need the title for that new frame. You would have to switch your registration and insurance, etc to the new VIN number. Your bike would become the bike that the VIN on the new frame says it is, in a legal sense.

You would have to do all the other leg work with getting the titled street bob frame off the books as well.

Not saying it can't be done or hasn't been done before. From the legal paperwork perspective, repairing your frame, or having Harley reproduce a frame for you is the easier route.

Edit: Or hack, tack, and weld like the above poster mentioned.