I very much doubt they will give you the part's back unfortunately, as for going elsewhere Breitling don't supply part's to anyone anymore so you might be limited in who can service it, that being said as it's an old watch you might be lucky and someone may have whatever part's it may need but finding that person is another challenge.
Personally I'd just let Breitling service it, what would you do with the old part's anyway.
Sent from a technical device