For anyone without a clicky source of charm break, make a macro. First line hide. Second line /target *your name*. Hit that macro, if hide fails, it targets you and you're ready to cast invis. If hide suceeds the /target will fail. Note: not sure if this works if you have a see invis item, it probably won't.
Doesn't work for OP since he chose human, but for anyone who chooses Halfling or Wood Elf and doesn't have a clicky invis, it'll save a step. Obvious downside is that you'll want to cast IvA with a 3 second downtime but the hide skill check is instant so on success the target will have 3 seconds too much health.
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