The handle can be longer, also she won't be be exerting the effort in holding
that is exerted in the pumping motion of operating the winch.

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The problem with electric winch handles is that you still have to hold onto
them. If your wife can't develope enough power to grind, how will she
develope the power to hold the electric handle? The only thing that an
electric handle solves is that it applies torque while you hold the handle
at the position which gives you the most mechanical advantage (eg: 3:00
and 9:00). You can do the same thing with a 2 speed winch by ratcheting
back and forth (say between 2:00 and 4:00).

You mention this will be used on the primaries. You might try puting your
wife at the helm while you grind.

David
S/V Nausicaa