It may seem childish, but it is a solution after all. Create a new export template^^^. Keep and manage all your created filters in it, in groups, with descriptions. When you need it, click on Export >> _filters (name it somehow) >> Edit --- it opens in your TXT editor application. Find and copy the filter, you need.
EditPad (...Pro) is the best TXT editor, in my opinion. For example, you can fold lines; color the text specifically in .mte files; and so on.
^^^ Or, create a TXT file anywhere + a Tool to open it in your text editor. It gives you a quick access from Mp3tag, too.
An idea: i use comments in filters. Examples:
problem IS "Empty tag" OR * MATCHES "(?-m)^[^\w]+$"
problem IS "Wrong tag" OR %_tag% MISSING OR NOT ((%_extension% IS flac AND %_tag% IS FLAC) OR (%_extension% IS opus AND %_tag% IS Vorbis Comment) OR (%_extension% IS mp3 AND %_tag% IS ID3v2.3 AND %_id3v2_character_encoding% IS UTF-16))
problem IS "Foobar mistaked" OR %album artist% PRESENT OR %date% PRESENT OR %tracknumber% PRESENT OR %initial key% PRESENT OR %rating% PRESENT OR %unsynced lyrics% PRESENT OR %encoding settings% PRESENT OR %grouping% PRESENT OR %source webpage url% PRESENT OR %organization% PRESENT OR %tmpo% PRESENT OR %composer%%arranger%%lyricist%%artist%%conductor%%publisher%%language%%genre%%wwwaudiosource% HAS ; OR %composer%%arranger%%lyricist%%artist%%conductor%%publisher%%language%%genre%%wwwaudiosource% HAS /
Another little trick. It is tiring always to wipe the filter after filtering. Instead, i simply choose with the mouse a predefined filter: filter MISSING.