Aye johnr,
Apparently sump is of the chamfered shape and if you give it some and loft the wheel, G-Forces plus the angle of dangle, put the oil where you don't want it, up the side of the sump!

Needless to say, "Dry top end!". How or why somebody should want to do this, I don't know!
It would appear that a flat billet machined sump and swinging pickup is one way to go., the alternative is to dry-sump the motor! Drag bikes and car applications being the likely candidates for the latter. At present, cash, is the necksaver!

Aye beezer764,
So long as you're happy that you have all the metal bits and giving the 'Old Girl' a good flushing with a refill of oil and new filter element, you go for it. I just tend to be a bit of a wuss, when it comes to 'metal bits' in motors!

Please note this has nothing to do with the Welsh term "wus", derived from "gwas" or a servant, a term of endearment, or so I'm lead to believe.
Whatever, I hope you get it fixed and back on the road.
My regards, Bill.