you mean the varieties like bullion now picture, these should be easy to tradeGood Delivery is typically 1000grams and larger I believe. I don't think Asian markets trust Perth mint, although Asian expats here love it. Hard to suggest what might suit your needs best. I would yearn towards ABC Cast buttons but doubt they have much recognition overseas.
Honestly don't know what to suggest besides previous bullion coins. What's your purpose for seeking non Asian bullion for Asian markets?