if you get tired of just code groups you might look at my posts for cwpt (cw practice text) you can generate lots of variations that can target specific needs
I just made what I think is a handy update specifially made for playing via lcwo
LMK is if have questions. The readme has many examples, but the number of options might be intimidating - falsely - they can be put in a file and I can help if you want to give it a try
either way good luck and keep at it
Bill WA2NFN I would love to see where you have the cwpt. Can you show me that?