@St.Stephan
We suggest to use API V2 for Binance and the BETA CSV importer. This will lead to best results according our feedback we get.
But if you miss only those card transaction then you could proceed as you described importing only those after editing the file.

@lerp
I could add a custom price and modify the asset value: https://cointracking.freshdesk.com/a/solutions/articles/29000038312?lang=en
And you would add a "lost" transaction for the amount you have lost.