Will flexible stirrups help with weak ankle?

I am back to riding after 7 years away. I have gained weight, out of shape and some new injuries I didn’t have before. I had my first lesson on my new OTTB, he did phenomenal and was very forgiving with me bouncing around on his back. During my lesson I was told to two point while walking and trotting, as well as dropping stirrups and picking them back up. I noticed that my ankle was burning and I really couldn’t get it into the right position. Now two weeks later I can’t even sink weight into my heel. Doctor says that I sprained my ankle but I feel like its worse then that. Well long story short will the flexible stirrup irons help to place my heel into right position and will they help prevent another injury?