Not only do Pilates, I teach it!
Once you are healed (and NO pushing that) and your doctor clears you for it, no reason not to start it up. Be kind and gentle to your abs at first, they need to re-learn post surgically.
One of my master trainers (and they never knew about
my condition since it's 20 years old, didn't see any reason to bring it up) had a client with an ileostomy. She made a few allowances for her. Me?? Since they didn't know, I did all the exercises, all the apparatus, including some I choose not to do now!