Repair key - Spring connector broken on unit itself

Shift key came off the other day. I have a donor keyboard that I have been scavenging off as needed so that's not unusual. However, previously when I've had this happen the actual issue/break occurs on the back of the key itself. In this case it's the tiny part where the spring slides into the main body (indicated by green arrow) that broke. I've got plenty of ideas on how to tackle this, i.e., melt it in place with soldering iron, use a two part epoxy - but was curious if anyone else has delt with it and if they had a clever or durable solution already. Thank you for your time.