No, simply you could only minus the lines of ToonC - ToonE lines.
If i we're you i would also change the modifier combination which identifies my toons, so to give a quick walkthroug:

1. Modifier Combination:
ALT + CTRL = ToonA
SHIFT + CTRL = ToonB

2. General keymaps:
ToonA:
'master-key' --> command.ToonA
SHIFT + CTRL + 'slave-key' --> command.ToonB

ToonB:
ALT + CTRL + 'slave-key' --> ToonA
'master-key' --> ToonB

3.Macros
- unbind all combinations of 'slave-key', an bind the simple 'slave-key' to a button
- bind macros like this to your button:

Code:
/assist [mod:alt,mod:ctrl,nomod:shift]ToonA;[nomod:alt,mod:ctrl,mod:shift]ToonB
/cast ...
or for follow

Code:
/target [mod:alt,mod:ctrl,nomod:shift,target=ToonA][nomod:alt,mod:ctrl,mod:shift,target=ToonB]
/follow
/targetlasttarget
4. enjoy