It's not as simple as one might think, for that, must drill a portion of the lower powerhead to add/insert a small tube & small hose to powerhead or cylinder head water circuit/passage. Need to drill a same size hose diam hole on lower pan for other side of hose to exit there Too complicated. How about installing a heat sensing unit to monitor, something that shuts CD off if cylinder head temp passes above its working temp ? Something like a thermo fuse attached to cylinder head could work. Ingenuity and creativity are limitless...
Happy Boating