\enabletrackers[math.greek,math.remapping]

% math | before: char: 003B1, alphabet: regular it, lcgreek: italic, ucgreek: unchanged
% math | after : char: 003B1, alphabet: regular it, lcgreek: italic, ucgreek: unchanged
% math | before: char: 003B1, alphabet: regular it, lcgreek: upright, ucgreek: unchanged
% math | after : char: 003B1, alphabet: regular tf, lcgreek: upright, ucgreek: unchanged

\starttext

$\alpha$ \setupmathematics[lcgreek=normal] $\alpha$

\stoptext
