So assuming we re-sign Cartwright and Greig, and don't re-sign Blake or Loizou, and maybe take up the club option for Ogden (if it's fairly cheap), then our best chances of saving money with apparent UK shifts like Murchie's among the others are:
Momoisea - still young and versatile at reggies level, but mid-season signings were parachuted in
Makatoa - who seems to have fallen out of favour/selection this year
Davey - I'd imagine Doorey can step up in that role as needed, and is 8 years younger
Dunster - I think Russell has now proven he's jumped ahead in the pecking order
I can't see us releasing anyone else - Hodgson has already cashed in his player option to stay, and Lumelume isn't top 30 so it doesn't matter what happens there.