[NTG-context] help for a polytonic greek type1 font

I have a small set of Polytonic greek as Type1 font with Adobe Encoding. I would like to wrap it as OpenType and use it for UTF-8 greek text, but reencoding with fontforge seems to fail (or at least I have not found a way to do it) I believe that I must do some manual work and I would like to do with MkIV. TIA -- luigi