Oh that's ridiculous, but then again they are hard to obtain and expensive. What scum to do it, and clearly planned as you need the right tool
The one's you need are 12 point star, chamfered edge with 24mm thread/shaft, total length inc head 31mm
For 10 I'd buy a scrap wheel or one in need of refurbishment and have the spares to keep or Ebay at £2 each.
Might be obvious but don't drive on the wheel at all. They are genuine split rims not cosmetic.