3-pc. locking skewer replacements are available at pricepoint.com for $40+shipping.

Long cables (3/8" thick) are available at W-M for less than $20. Master Lock Python is in the RV section for $18. Something like 5' of cable, lock is adjustable along the length of the cable. The 3/8" cable is something like 6-9' long -- I have one, and a security padlock.