\starttext
    \enabletrackers[math.greek,math.remapping]

    \switchtobodyfont[iwona-light]  $ \mathgreekitalic  {\alpha} {\bf \alpha} {\bi \alpha} {\char"1D736} $ \par
    \switchtobodyfont[iwona-light]  $ \mathgreekupright {\alpha} {\bf \alpha} {\bi \alpha} {\char"1D736} $ \par

    \switchtobodyfont[iwona]        $ \mathgreekitalic  {\alpha} {\bf \alpha} {\bi \alpha} {\char"1D736} $ \par
    \switchtobodyfont[iwona]        $ \mathgreekupright {\alpha} {\bf \alpha} {\bi \alpha} {\char"1D736} $ \par

    \switchtobodyfont[iwona-medium] $ \mathgreekitalic  {\alpha} {\bf \alpha} {\bi \alpha} {\char"1D736} $ \par
    \switchtobodyfont[iwona-medium] $ \mathgreekupright {\alpha} {\bf \alpha} {\bi \alpha} {\char"1D736} $ \par

    \switchtobodyfont[iwona-heavy]  $ \mathgreekitalic  {\alpha} {\bf \alpha} {\bi \alpha} {\char"1D736} $ \par
    \switchtobodyfont[iwona-heavy]  $ \mathgreekupright {\alpha} {\bf \alpha} {\bi \alpha} {\char"1D736} $ \par

  % \switchtobodyfont[cambria]      $ \mathgreekitalic  {\alpha} {\bf \alpha} {\bi \alpha} {\char"1D736} $ \par
  % \switchtobodyfont[cambria]      $ \mathgreekupright {\alpha} {\bf \alpha} {\bi \alpha} {\char"1D736} $ \par
\stoptext
