Changing stylized 'anime' subtitles to one standard font?

Hello all,

I’m using MKVtoolNix via unraid.

Basically, I really dislike stylized subtitles and as lots of anime do not come with standard fonts I would like to patch convert my collection into just one font.

On Windows, Media player classic does this for me, with a default setting, however, Jellyfin via unraid will not play ball, so I think it best to convert my collection.

Can someone help me out with how I might go about doing this?

Thank you in advance.