Just a small comparison for completeness between rigid groups and the average female with helpers human ... it is not much difference, the rigid groups is slightly better for this kind of shoe.
Btw.: When you use the skeleton with all the toes and only pose one toe, the shoes with and without rigid groups make funny things ...
I will upload these shoes tomorrow and I will use the rigid group version ... but you have to copy your skintemplate to the texture, when you are not using "young caucasian female" ...
You also then may notice, that these heels are very tight in front like in reality, so I also remodeled part of the feet to simulate this.