I agree it's not the best practice to start cuttings but not so sure about your assertion that removing now will kill these. All commercial propagators repot rooted cuttings whenever they are ready at all times of the year.
You will need to check these have roots. Many cuttings will put out new shoots using energy from the stem. They don't always have roots below at that stage.
If you can confirm these do have roots just cut around them and lift them out and transplant. Losing a few roots won't usually worry a new cutting.