\usepackage[T1]{fontenc}\usepackage{lmodern}\DeclareFontFamily{T1}{lmr}{}\DeclareFontShape{T1}{lmr}{m}{n}{<-> ec-lmr12}{}\DeclareFontShape{T1}{lmr}{m}{it}{<-> ec-lmri12}{}\DeclareFontShape{T1}{lmr}{m}{sl}{<-> ec-lmro12}{}\DeclareFontShape{T1}{lmr}{bx}{n}{<-> ec-lmbx12}{}別のファミリも同じようにできそうです。