You wouldn't want to compromise the light on the easel necessary to see your work well.
If I correctly understand the problem -- the easel light is messing up the lighting you've tried to establish on the cast -- what I would do is hang a yard of fabric or a piece of cardboard somewhere between the cast and the "offending" light, to block the direct influence of that light. It won't take much to effect the necessary interference.
This will again call upon you to improvise -- you might have to sew a dowel into the top edge of the fabric so that you can hang it from two threads attached to the ceiling. Those spring clamps mentioned earlier can sometimes be made to hold the cardboard.
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