> While drilling through such a cavity and sealing it at inner and outer
penetrations would be "annoying" ity doesn't sound overly hard or complex

This may be true but the "unscraped" patches are at the base of the bowl
where reside an oil reservoir and the heating elements. This is the thick
of it all, and the hottest part. Any protrusion would need to be a tiny
stub (to miss the paddles) and probably in direct influence of the bowl
itself.

But more so it's out of my league. I'm sure a properly trained person could
do the job but I've seen enough to know they'd cost a bomb.
--=20
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