If the twins do try to represent Ireland next year... I wonder if it wouldn't be fun if they let their fans pick their entry. I don't think any other act has tried this before.
For example, why not have another 'intimate concert' in August in Dublin. Pick 4 or 5 songs off of their upcoming album and perform these songs for the fans. Have the fans pick which one they should enter for the Eurosong.
Re: mentor... is this required for Eurosong? If not, then no problem. If so, then ask if they can mentor themselves, or ask Caroline to help them again. If Caroline is unwilling or unable, find someone else.
I think the entries have to be submitted to RTE in September? So, August would prob be the best month to do this.
It would be fun... and different.