Here’s one thing that works, but is kind of messy. Give the C++ variable a different name. Then right click on the BP variable and select “Replace References”. Select the C++ variable and it’ll update all the nodes. Unfortunately, it won’t connect them. So you have to manually reconnect all the nodes. Then you delete the BP variable as it’s no longer used. You could theoretically rename it back after saving and using a redirect. Then you need to save once again.