While some hardcore Aperture users might object to the idea of working with Lightroom, it actually has some very useful functions, especially when it comes to processing images. If you want to work mainly with Aperture, but occasionally want to use the editing functionality of Lightroom, there are a few ways to go about it. You could use Catapult, as outlined in the previous section as it works perfectly well with Lightroom. You just have to remember to set the pickup folder as your output destination, when exporting out the images. You can save this as an export preset, so that you can quickly send files back in the future.
If you don't have catapult there is a way to set up a similar workflow using the built-in functionality of Lightroom, and with a little help from OS X's automation tool, Automator. The following is a step-by-step guide for setting up this workflow. It's a little tricky, but once you set it up it's very simple to utilize.