🚀 go-pugleaf

Maybe one useful starting point for emboldening letters, if one is
willing to understand the complexities of font sources, is to modify a
copy of the Sauter fonts.  John Sauter has written MetaFont source
files for the CM fonts that parameterise the "design size".  Reputable
sources assert that the TFM files are the same as Knuth's CM sources
produce.  By using Sauter's sources, it's therefore conceivable that
one set of changes can embolden, say, cmmib, from design size 5pt
continuously up to 50pt.

Karl Berry has packaged Sauter's fonts for unix.  Also, it's not hard
to set them up for vanilla DOS.

Geoffrey Tobin