You'll not find a bigger defender of soundfonts than me. So of course I made one.
DSINK GM 32K is a GM-compatible* soundfont in which every sample is sampled at 32khz and the entire sf2 fits neatly inside 32 MB. It's inspired by old game consoles which needed to use sample-based sequenced music such as the SNES and Nintendo DS.
I can't put it on any distribution sites for legal concerns, but nevertheless you can download it here: https://dafor.link/soundfont.html