The following is simply my understanding, not advice, as always DYOR.
If the DTC election wasn't completed, or wasn't completed correctly then a DWAC can not be undertaken. The DTC election appears to have required the international trading account number to be entered even though it was noted as optional on the form. So, if you don't already have the international trading account and the DTC completed you can't undertake the DWAC. If you've received emails from Computershare I think this is a good indication that the DTC wasn't successful.
If you undertook the DTC election successfully, you have until tomorrow night to submit the DWAC.
If the DTC wasn't completed, share holders now need to use the Computershare log-in to manage their shares, and I assume from here you can do a broker to broker transfer into any international brokerage account, regardless of the DTC election and regardless of the broker being a DTC participant. Reading between the lines, the DTC election process was the fastest way to get your shares into a trading account so holders could trade after the merger and listing. The Computershare path is open for 6 months to allow people who didn't, or don't have an immediate requirements or desire to trade to move their holdings.
Westpac link is below:
https://www.westpac.com.au/personal-banking/share-trading/join/open-account/?searchsource=search-results&kw=westpac%20share%20trading&cat=personal-product&rank=2&result-type=natural
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