There's actually a phenomenally simple one built in to Windows
If you go to Run, eudcedit.exe
(
zeltergiset,
Fri 8 May 2009, 0:56,
archived)
Don't seem to be able to copy & paste characters to other letter assignments though
I'll have a gander at that one you linked, ta very much.
(
zeltergiset,
Fri 8 May 2009, 1:06,
archived)