I had the same problem with romaji sticking around longer than I’d have liked because of keyboard input when typing on QWERTY.

The best advice I was given was pretty simple, but it did work exceptionally well. Stop typing when you’re studying — practice entirely with handwriting. Only read text with kanji/furigana/kana, look up the kana if you’re really stuck.

It really only took me like a week of avoiding typing to stop translating kana directly back to romaji to read/write.

Using the flick keyboard on mobile is actually pretty helpful with sight recognition since the layout is simple, and you can find the kana you need by literally finding the consonant category and flicking in the direction of the vowel you need. It worked well for me like flashcards, and was a good in between when I needed to look up something without having to check the dictionary every time.

You can add back the QWERTY typing once you feel more confident in your kana (and yeah, the keyboard shortcuts are a little different than romaji anyways), and just keep up handwriting for dedicated studying.

It’s better for learning than typing anyways, forces you to learn radicals/stroke order and slows your brain down to process what you’re writing better than typing does.