Have a look at Falcosoft Soundfont Midi Player.

Another alternative is FluidSynth, which is cross-platform, though can be tricky to set up as it's a command-line application or a library. It's used in the MT32-Pi, for instance, running on the Circle bare-metal environment for the Pi.

Kamerat has already mentioned FSMP so here is a demonstration video from Phil about how to achieve something similar to what you want:
https://www.youtube.com/watch?v=zRyPjvbDkvg&t=8s

Thanks all!

softmpu over a serial null modem connection between pc's is the way i do this. there are roland or yamaha serial midi drivers you can install on the soundfont pc under win9x/xp/later? or hairless serial midi bridge for winxp-10 (or linux).

munt, timidity or falcosoft (vsti) midi player can connect directly to the incoming serial midi port or you can use midiyoke/loopmidi to connect to any other midi player like fluidsynth, roland vsc, yamaha syxg50 etc... here are some example workflows:

dos pc > softmpu > null modem cable > roland serial midi driver > falcosoft midi player > bassmidi vst (or any vsti)> sf2 soundfont

dos pc > softmpu > null modem cable > yamaha cbx200w driver > timidity (player or service) > gus/sf2 soundfont

dos pc > softmpu > null modem cable > hairless serial midi bridge > midiyoke/loopmidi > fluidsynth > sf2 soundfont