I spent a hot, dirty and dusty couple of hours with my battery drill and a nylon abrasive brush and it now looks like this:
The nylon brushes are quite aggressive and can score the aluminium if you lean on them too hard but they do get the crud off. The original Ducati paint, where it was still evident, virtually came off of its own accord. The paint applied by a previous owner with a bog brush/trowel was a little more troublesome. Lack of additional battery power stopped play, nothing below the oil sight level has been touched yet and above it detailed removal is still required with a dremel and a small brass brush, so at least two more hours work just to remove the old paint /crud.
I am awaiting delivery of M12 x 1.25 bolts so that I can make a jig to bore the crankcase SA hole 26mm to accept either the standard needle rollers or bronze bushes (not decided yet) either way a grease nipple will be added.