I am definitely open to this possibility because I would love his brothers to truly love Sanji and be sorry for the years of abuse and get redemption but I doubt this is the route Oda would choose, it just seems a little out of touch with this arc and their backstory. Admittedly though I don’t really know what else Oda is going to with them other then somehow redeem or kill them or sent them to prison.
On the other hand this possibility is also not baseless on Sanji’s part IMO, I mean he is definitely compassionate and I think he would also be open to help cure his brothers