I know smart props don't bend. They are really only .obj or .3ds in origin.
Say you create s regular slip on pump. Why for the love of pete make it as a conforming prop? It doesn't need to move once on the foot and if the prop os made properly it works fine as is.
I have had to always go in and re-export these items out again as individual left and right foot props so I could use them on other figures.
Say you create a great hair. why do it as a Conforming figure when some of the best hair out there by Quarker and AprilYSH, Kozaburo and others are regular fully posable hair files that you can use on all figures. I wish i knew how to  onvert conforming hair to regular .Hr2 hair props. I would be HAPPY!
I understand the toe cap would be sweet if it wiggled and spread with the toes to make it more realistic. if that can be had super hallewooya!  :)
But I have an old smart prop toe cap I use from time to time when desperate for V2 & the MilPt and it gets me by. The prop parented to the toe goes up and down and side to side and twists with the toes. it does not wiggle or spread for individual toe movements but how many of those does V2 have in the original mesh? Very few making it a non-issue. Of course if it was a what you are proposing for Antonia....Wigglie kind!...for a foot fetishist like me that would be DeVine!