I'm not sure if the Apple Store will do that but it's super easy to do yourself. Watch this tutorial on how to install an SSD in the main drive bay, this tutorial on how to install a second SSD in the optical bay, and this tutorial on upgrading the RAM. The MacBook Pro you linked is more than sufficient to run Ableton. I use one just like it every day although it was much slower before I did the SSD and RAM upgrades. Here's a link to the SSD's I use and here's a link to the RAM upgrade kit for that computer. Upgrade at least the main drive to the largest SSD you can afford and max out the RAM to 16GB. Enjoy!