lila-openingexplorer VS chessmadra-frontend

https://github.com/lichess-org/lila-openingexplorer (a database with stats for billions of chess opening positions)

Lichess' opening explorer looks like it's open source and can return an opening name from a given position: https://github.com/lichess-org/lila-openingexplorer

Final touches for lila-openingexplorer, a new chess opening database for lichess.org. Uses axum and rocksdb.

Here is the open issue on Github of it https://github.com/niklasf/lila-openingexplorer/issues/63

Create a repertoire with ChessMadra

Listudy: Memorise openings with spaced repetition. Chess Endgame Training Chessercise: Practice chess with YouTube. Chess Madra: Build and practise an opening repertoire. Aimchess: Learn your strengths and weaknesses.

Chess Madra for building and practicing an opening repertoire.

Also there is always Chessmadra where you can build an opening repertoire tailored to the moves you encounter at your rating.

Check out ChessMadra. It's more of an opening repertoire builder than "randomly selected", but with spaced repetition.

It doesn't make much sense to study openings to an absurd depth, as you said. Opening principles are much more important as soon as you are taken out of book. But It should be possible to build your repertoire with the Catalan in mind for your rating range with ChessMadra. Put in your rating range, build and drill it.

I use chessmadra.com. Works pretty well for building a repertoire and practicing, plus had access to lichees opening database. Is completely free.