A heat gun was my first thought. 63c is a big difference though, that’s the gap between freezing and the temperature I like my coffee in the morning. I’m not a materials expert though, so I have no idea if that difference matters. If you’re able to pull this off, then it’d open the door for many of us like myself!
“Low temp solder” isn’t something I’d think I’d want to put onto the hottest part of a computer… but I guess it’s not supposed to get higher than 100C so it’s likely fine?