I posted many pages ago my discussion with Comsec. When you tick the box to have shares listed on nasdaq, you only have to join comsec international trading to sell them. I was advised by comsec to only join 6 wks before you were looking at selling, and no yearly fee incurred. If you want to trade them, that will be a completely different story. The cost was something like $65 per year to keep the account open (charged if no trades in 12 months).
Will it cost you anything to joing something like the us version of chess to actually hold the shares when they are converted? Do you have any idea how to do this?