I am definitely not an expert, but here in Decatur we play a lot of 50/50. One of our (and my favorite) ways to attack from there is to dive both of your arms underneath the leg that is preventing the inverted heel hook and drag it across to your other hip. From there you can trap his leg that normally prevents the inverted and take it. Also, you can threaten a weak, but scary, inverted on the other leg and that will open up the normal inverted.