Are there any alternatives to the $400+ external shutter remote that can do auto bracketing for a canon 700D?
Basically some shutter + a click wheel that adjusts shutter speed without touching the camera (applicable in multi exposure situations)
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There are a lot of options on Amazon, like this one. The basic idea is you put the camera in bulb mode and use the intervalometer to control the shutter. Some may have AEB settings, or you can adjust it yourself.
You can also skip the external intervalometer altogether and try Magic Lantern. It supports exposure bracketing by the shutter or ISO. It would be in camera and free.
CamRanger is a good system, although pricey it also does quite a bit more that you may find useful. Here's some information