I'm baaack. Couldn't help myself either glekichi.
CAAP 234-1(1): Guidelines for Aircraft Fuel Requirements
6.1 Subject to subsection 6.2, where it has been determined
that an alternate aerodrome to the destination aerodrome is
required, then the amount of fuel on board an aircraft at any
particular point in the flight should be an amount that is
sufficient:
(a) to enable the aircraft
(i) to fly from that point to a height of 1 500 feet
above the destination aerodrome; and
(ii) to make an approach to that aerodrome; and
(iii) to make a missed approach to that aerodrome;
and
(iv) to fly to the alternate aerodrome; and
(v) to make an approach to that alternate
aerodrome; and
(vi) to land at that alternate aerodrome; and
(b) to enable the aircraft to continue to fly at a cruising
speed for a specified percentage of the time that it
would take to fly in accordance with paragraph (a),
being the percentage specified in Table 1 of this
CAAP for that category and class of aircraft; and
(c) to provide for contingencies of the kind described in
section 8; and
(d) to provide holding fuel to take account of any traffic
delays of the kind mentioned in paragraph 4 (c); and
(e) to provide the fixed fuel reserve that is specified in
Table 2 of this CAAP.
Not conclusive for my side of the argument (as you would have to agree with an ATSB research report) but again this CAAP does not specifiaclly mention that alternates need only be provided for preflight.
Happy to be proven right/wrong as aviation is all about learning.
Edit
Fair enough unhinged.