Heirloom rings and soldering?!?

Hi! So my fiancé proposed with his great grandmothers heirloom ring. Over 100 years old. I love it so much and it’s uniqueness! I recently got it checked out and the prongs tightened (stone was wiggly) and picked out my band! The jeweler mentioned option of soldering which I’m not sure about since it’s such a old ring and has been passed down through his family, and we want to continue that. I just don’t know how I feel about soldering the rings together because I know once you do it it’s not a good idea to reverse. But I also don’t want my e ring to get damaged by my band sliding around. So wondering what other people with heirloom e rings do regarding soldering? Attaching pic of my e ring and new band! Which will be made in platinum this was just a picture of the ring I tried on in the store. The original band which my future SIL has had hearts around the band so I saw this one and thought it would go perfectly since I don’t have original band that went with it