Assuming your ASUS router has the same options as my ASUS RT-N16, you might be interested to know that there's a poorly documented setting on the Wireless-->General page for "Authentication Method". If you set this to "WPA-Auto-Personal", it will default to WPA2 for clients that support it, but will also fall back to plain WPA for older clients like the PS Vita, which apparently doesn't support WPA2. For the most compatibility with older clients, you probably want to set the "WPA Encryption" setting to "TKIP+AES" as well.
GroovyMAME support forum on BYOAC
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