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There is no such thing as custom brushes in AE. You can try and use particle systems that follow the contours and drop a particle that stays in place every so and so many pixels. Conversely, you can create a particle grid and feed a revealing stroke from a pre-comp as a parameter map for visibility/ opacity or scale into it. Realyl depends, but in any case you need to take a different approach from Motion.
Thanks, that's a shame. It would literally take about two minutes in Motion. Hey ho.
When I need something that motion can do with a single click for a client that does not mind canned effects I use motion. I am in business to make money first because without money you cannot pursue your artistic goals. I would use motion, render with an alpha channel and then use it in your current production.
If you really want to create a custom brush and use it in AE you can use this technique that I posted a while ago: Re: Repeat Shape Layer along path?(Message) By Rick Gerard, posted May 28 2013