The open alternatives don’t have particularly good UIs which was a massive perk of GitKraken.
These days I rely heavily on the Git UI within jetbrains various IDEs. If you’re working on open source projects then you can get a free license. Or they do educational discounts. If you’re using it commercially then it’s going to be roughly the same price as for Kraken but you get a best in class IDE included…
I had the same issue so wrote this down when I figured it out
Generate ultimate key
Add sub key
List keys in long format