I actually have plenty of thick leather scraps from a neighbor who
makes belts. How should I construct the shield? Just a roll to
cover left hand and wrist?
Think if it like a leather glove with everything cut off except part
that covers your thumb, forefinger, and space between them.
Also, to minimize danger and to increase steadiness I would rather
hold my graver in a two handed sword grip, rather than use my
dominant hand. Have you ever seen done ever the use of two hands
to push graver?
I have never seen two-handed use of graver.