Yeah it makes sense, you could do it with a micro controller, what you're describing is pretty simple, and could be done with a really cheap micro controller and maybe a capacitor to filter power. An 8pin soic package is actually a little smaller than the servo connectors you're using, you'd need to buffer the power with a capactor but that's a bout it no other components would be required you wouldn't need to use a Pc board or anything just solder it all up by hand and use a non-conductive epoxy to encapsulate the whole thing.