You can get all the documents sent to a friend who will add it in and submit the package BUT make sure you put everthing together before you send it to this friend with VERY clear instructions on where to add what and where to send, etc. There would be nothing worse than intrusting it all to a friend only to find out later it was not submitted properly.
I had everything sent to me (statements from family/friends, tax documents, etc) so that I could put it all together myself and then I submitted it from over seas.
To clarify what KelKel was saying - the financial documents are not intended to prove your income (because there is no income requirement for spousal applications) but rather to demonstrate that you still have ties to Canada and are intending to return. I submitted tax returns for all the years I was overseas but filed in Canada, for example. The Option C printout is the only financial document required to show income and it IS mandatory.