Turn a small drill press into a Bore/ Hone. Bolt it to the top of your engine block & do your own machining .

I'm guessing your oblivious to the fact the deck surface is neither flat, nor perpendicular to the crankshaft centerline.
Your refering to the Bore Head Core tool? I am working on connecting it to the chuck with "Sloppy Shaft Techlogy" Ha.