I generated some subtitles with Aegisub using VSFilterMod and its extra override tags, but found out too late that pretty much no media player supports them (granted I've only tried PotPlayer, VLC, MPV, and MPC-HC).

I'm on PotPlayer and can technically get it working with the following AviSynth script, but the playback gets really slow really fast.
Code:
potplayer_source()
TextSubMod("path\to\subtitles.ass")