I don't know the VK rules and allocations, so I can't comment on the legality of the operations on that particular frequency.
I know its a bit late, here is the Australian (VK) Band Plan for 40 Metre.
40 Metre Band – All licence classes
7.000 - 7.300 CW
7.030 - 7.040 Digital data modes (Note 2)
7.040 - 7.300 SSB
7.075 WICEN frequency
7.110 IARU Region III emergency centre frequency
7.130 - 7.150 WIA news transmissions
Note 2: Modes
"Digital Data Modes" includes all modes such as RTTY, packet and Amtor, using FSK or PSK and with
bandwidths up to 2 kHz. The SSB segment can also be used for digital voice modes and image transmission
modes such as SSTV or Fax, using bandwidths up to 4 kHz, or for AM.
For a pdf of Australian Bandplans, go to this link:http://www.wia.org.au/members/bandplans/about/ then click on Bandplan Data (left hand side).
Myself when trying to work stateside from VK I try to be around 7.170 MHz or higher.
Now 80 Metre DX Window is a different kettle of fish in VK
3.776 - 3.800 DX Window SSB and CW.
NOTE: DX WINDOW
Emissions must not extend below 3776 kHz. Therefore when using LSB, the suppressed carrier frequency
should be no lower than 3779 kHz.
Also the Oceania DX Contest is being held on these dates,
PH - The first full weekend in October each year from 0800 UTC Saturday to 0800 UTC Sunday
CW - The second full weekend in October each year from 0800 UTC Saturday to 0800 UTC Sunday
Log deadline for PH and CW logs - 28 days after the end of the CW contest.
For more info go to the web page: http://www.oceaniadxcontest.com/