I believe the new planets that could be do-able, make sense in-universe and are significant enough are
- Naboo
- Corellia
- Kashyyyk
- Cantonica (Maybe that shot with the broom kid could be repurposed)
- Kijimi.
If I had to choose one planet from the expanded universe, I’d say Nevarro.
That way one has representation for all trilogies and the spin-offs, including planets that are significant to the heroes in some way (Corellia, Kashyyyk), or that were seen placed under a nasty First Order regime (Kijimi), making the montage have more of a catharsis feel rather than adding planets for the sake of it.
I’ve also been interested in repurposing the shot of the broom kid. I actually briefly tried to mask out clips from Rey’s visit to Tatooine to create a scene of her visiting the Broom kid (presumably buying his freedom) but there wasn’t enough footage and also I’m not that good at masking.