No, the farthest you can do with Tasker is "Compose MMS" which just populates your MMS app, but you will have to hit send manually. You could fake user input with shell scripts or AutoInput to hit send for you though. There is a plugin, "screen filter" I think it's called, that will let you dim the screen much more so than with stock controls (see black) so you could hide whats going on, sort of...