The retail/Wholesale funds may have different conditions than the ETFs (Exchange Traded Funds), the Retail/Wholesale funds you purchase directly from Vanguard. I don't use the retail/wholesale funds as they have higher expense ratios for effectively the same product.
ETFs you purchase through a broker (Such as commsec, etrade, NAB Broker etc) just like shares in individual companies and you won't be dealing with Vanguard directly (there is no reason to ever speak with them), you purchase through your online broker and ongoing management such as where dividends are paid or if you use dividend reinvestment etc is through the share registry (Such as link market services - can't remember who Vanguard uses specifically) . You can use online brokers such as commsec as a non-resident, they even have FAQs to help such customers out. You can likely set up an online brokerage account with your current bank completely online (I have done this with a new account recently)
With ETFs you pay brokerage whenever you trade (Buy or Sell) which varies, from memory about $15-$20 allows a trade around $5,000 or $10,000 (Larger amounts get cheaper from there) you can't set up automatic monthly payments however.
A simple 3 fund solution with Vanguard with Australian bias is something like,
VAS - Australian Shares (ASX300)
VGS - International Shares - which is currently 60% US. Some prefer VEU (world Ex-US) and VTS (total US market) to control the balance between US and rest of the world, I don't see any benefit in.
VAF or VGB - Bonds (if you are inclined to hold bonds, I don't)
Here is some general information on ETFs and a video
https://www.commsec.com.au/products/exchange-traded-funds.htmlI am certainly no expert, however there are no barriers to investing in ETFs through a broker from everything I have read. If you can setup an online brokerage account through your Australian bank you'll be able to buy ETFs. All the big four (CBA, ANZ, WBC, NAB - others probably do too) provide online trading accounts for free.
One thing I definitely would NOT be doing is altering my details on the application to get a retail managed fund through Vanguard.