Are there any scripts that allow you to write a reading using Katakana without getting it wrong (when it would normally use Hiragana)? My Katakana is fairly weak and this would be a great way to work on it - constant exposure from writing in the readings in Katakana (no harm when you are fully aware Hiragana should be used).
Look for katakana madness script.
Initially misread your post.
I had tried this and saw it “didn’t work”. I was trying it on vocabulary, but I now see it is for on’yomi readings. I may just have to add on to the script and make it work for all readings (because vocab is the most abundant and would help the most to have in katakana).
Anyways thank you, this script is a good start!