@jeffcliff リピート is already in the dictionary for repeat;
- Repeating, repetition.
- Repeat (performance), rebroadcast.
- Repeat sign.
- Playing (an audio or video recording).
- Repeat consumption, consumer loyalty.

You can write something else, but you'll end up with most not knowing what that means, as I can read カタカナ and I had no idea what any of those meant until I inserted it the first into a dictionary.

If you're using an English word, you should just write the English word really.