Unfortunately, no - we don't have the facility to offer an alterations service. This said, we do have free returns and exchanges, so provided that the new leg length that you want is within our saleable range (28"-36"), we're more than happy to just exchange them for a shorter pair for you.
Fill out your exchange requests on your returns form, re-use the packaging that your SPOKEs came in and slap on our free post label which would have been included with the original order. We'll be in touch to let you know when we've received them and when they're on their way back to you. Alternatively, you can send the originals back to us for a refund and then just pop a new order through the website.