If you have been working on apprentice, you could try to go straight into extended butterfly from there. Basically, in a split grip, use your knee to lever up the outside leg and get your ankle around the pole. From there, when you are stronger, you can push up and out into extended butterfly. To build up to that, you can get into the position by just sliding your lower hand down the pole after hooking your ankle, so that you are just pushing away from the pole, but not up. Whether this is doable or not would depend on your apprentice, but it might be something to try since you'll be starting with your ankle on the pole rather than having to get your stuck calf to release, Just an idea.