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@mespilus
http://www.hss.com/g/30618/Multi-Head-Floor-Scabbler.html
is the type of thing I have use commercially,
but,
the cost suggests angle grinder + time + dust (lots of dust)
is the way to go.
I would suggest a series of longitudinal angle ground grooves approx inch apart
a bit (4-5mm) deeper than needed,
then,
biggest sds you've got, or can borrow, on 'chisel only' mode,
laterally to remove the unwanted concrete,
leaving a really good keying surface for your chosen self leveller.