yes you can at the size 1 pointe shoe shop that specialises in size 1 pointe shoes in honululu
It depends on the brand. In some brands, like Bloch, a women's size 4 1/2 is a size 1 in pointe shoe. Use the chart in related links for reference.
Women's would be 1 1/2 bigger than men's so... 11 1/2 is your size in women's if your men's is 10.
I almost positive it is a size two in Canadian/U.S.A. sizing.
Men - European 40-41 for USA 7-7.5 Women - European 38-39 for USA 7.5-8
How to Buy Shoes Online
How to Compare European and American Shoe Size
Shoe Size
Importance of Finding Shoes That Fit Your Child