A rumour I heard from a (now deceased) colleague would be a good Woulda, Coulda, Shoulda. Basically Australia didn't deploy land forces to Desert Storm because their armoured vehicles were seen as not survivable, this bloke I knew was a WO combat spanner in 1 Armoured Regiment at the time and told me that Germany offered to provide Australia with vehicles straight from their stocks so that 1 Armd and possibly the whole of 1 Bde could have deployed. Think Leo 2s (and / or Leopard 1A5) and Marders, plus Fuchs and possibly Lynx equipping an Australian brigade group in Desert Storm. Also at this time Australia had quite good relations with Sweden and it is conceivable (though unlikely) that the S Tank could have been offered to beef up the DFS / AT capability of the mechanised infantry or cavalry in the initial Desert Shield phase before being used as assault guns during Desert Storm.
A desert diorama of buff or sand painted Leo 1 A5, 2s, Marders, M-113, MRV, S Tanks, etc comes to mind.