In message , Tom
writes
I'm looking for a quite slow rotational speed electric wirebrush, or a
design that has a wide (~5cm) brush wheel or separated twin wheel
pair (Segway style). In both cases with the brush wheel's axis
perpendicular to the power tool's body length so that it doesn't
snatch sideways as does a drill supporting a brush wheel. In the mode
I describe any snag against the brushwheel must overcome the inertia
of the power tool so it should be more manageable.

Angle grinder!

Seriously. Find one with variable speed control. Big dust problem if
these are soft bricks.

regards
--
Tim Lamb