as you start to increase the number of class types, you increase the complexity. you are basically attempting to squeeze 2 keyboards into one.

one method for dealing with this is keymaps.
you would make a keymap for each class type... and it will translate the keys between the classes for you.
if you use commands, loading keymaps is simple... just specify the file and it will load upon launch.

defining the keymap can be more challenging for some people.
basically, you need to define a key and string (english phrase... do yourself a favor and don't use spaces or capitals) pair for each key you care about.
the common link between keymaps is the string. it will be sent to all clones.. and ignored unless associated with a key.

for example, your mage might have fireball on 2 and the warlock has shadow bolt on 4... so...

mage keymap:
--
key: 2 string: main.shot

warlock keymap:
--
key: 4 string: main.shot

notice that the strings are the same. that's what matters. basically, when you are on your mage and hit 2...a 4 will be delivered to the warlock. you could also have keys used by one that are ignored by the other.

if you want more info, please let me know.

have a great day!