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I would strongly suspect that the original yokes are forgings rather than castings, and if that is the case then they won't have the brittleness of a casting.
In fact, a forging would be stronger than the same item machined from billet (all else being equal).
And I have also had confirmation this afternoon that Ducati machine the same basic part (same cast/forged number) to different bores, and also that some aftermarket upgrade yokes come with shims as std.
Incidentally, I happen to know that B&Q used to sell sheets of 0.5mm thick ally for gas fire backplates.
I see no reason at all why you couldn't cut some shims from flat sheet.
They wouldn't have the flange of course but, in my opinion, this is really only a fitting aid and indeed the aforementioned supplied shims have no flanges on them.
Obviously, ally shims are needed rather than steel, to avoid electrolytic corrosion amongst other reasons.
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