From my experience with undo-tree, C-S-/ is a good binding.
It is easy to reach right after hitting undo (C-/). Direct access is a little bit hard but you don't tend to press it directly that often.
Nathan
[[[ To any NSA and FBI agents reading my email: please consider ]]]
[[[ whether defending the US Constitution against all enemies, ]]]
[[[ foreign or domestic, requires you to follow Snowden's example. ]]]
> > I have nothing in principle against switching to an Undo/Redo system.
> > But there is an obstacle: finding a key for the Redo command.
> C-< ;; for Undo
> C-> ;; for Redo
These are hard to type, since they require Shift.
And they do not exist on terminals.
--
Dr Richard Stallman
President, Free Software Foundation (https://gnu.org, https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)