Perhaps. In theory, you’re definitely right. I just feel that this is something where building the momentum during a single election cycle isn’t feasible. The most likely result of voting for a third party without laying this groundwork would be splitting the vote and giving a landslide victory to the greater of the two evils.
Formally organising online would make it possible to demonstrate how much support each candidate actually has without giving an official vote to a candidate that the general public isn’t confident enough to vote for. Watching participation grow and third parties receive substantial semi-official support could build excitement and lead to a third party being trusted to have the sway to win.
I’d love to be proven wrong though. If we can organize enough support for a third party within a single election cycle that it’s reasonable to risk voting for that candidate, I’m open to it. I already have too much on my plate, but if no one has built this service by the time I have energy for it, I’ll definitely be thinking about it