If the funds are processed by IT on Thursday night and they have your application form, there is no way they can refuse your application just because you didn't enclose a print out of payment. The money will be in the account. All they have to do is look. This is just Computershare being lazy and wanting shareholders to do their work for them. Why Companies don't all use Link registry services beats me. They have a much more user friendly and accessable web site and are much more civil to deal with.
I have my doubts about SEA mainly their point of difference and surety of supply of raw material, and also the price after the share consolidation, which never seem to go that well, but will put some funds in, mainly on the back of Tim Preston's reputation because at this stage there isn't much more to go on.