Addendum to that doc regarding U+F216: Since I wrote the description in that doc on U+F216 (p. 34), I have found attestations of esh with retroflex hook.
BTW, you can expect to see most of these characters in a proposal at some point in the hopefully not too distant future; many of the phonetic symbols are being considered by UTC this week. Peter Peter Constable Globalization Infrastructure and Font Technologies Microsoft Windows Division
