This weekend, my TW ate a rock into the chain/rear sprocket. It bent one link, but the chain did not fully fail. I was able to limp the bike back to the hotel ~6 miles at 20 mph. Every minute, or so, I'd hear a nasty whack of the chain link hitting something (not sure what yet.)
I plan to replace the chain and sprockets (if they are damaged). I'd like to add some sort of chain guard to keep this from happening again.
Polisport Motorcycle Chain Guide 329553
I think you could adapt just about anyone with a 1"-wide aluminum strip mounted from the existing chain guard.
I cleaned up my install today with some right-length M6 bolts. I also found some other M6's that were just a bit longer for the existing rear mount to account for the 1/8" aluminum plate thickness.
I rode it around today and it seems fine.