\mainlanguage[es]
%\setuphyphenation[method=traditional]
\usemodule[simplefonts]
\setuplanguage[es][patterns={es,agr}]
\definefallbackfamily [mainface] [serif] [Old Standard] [range={greekandcoptic, greekextended}, force=yes, rscale=auto]
\definefontfamily [mainface] [serif] [TeX Gyre Schola]
\setupbodyfont[mainface,11pt]
\starttext
...
\stoptext