I'd be very surprised if you are unable to remove the cantle. If you can you can use a silver dip. If you are unable to get it off then protect the rest of the sporran by sliding bits of plastic card and plastic bags under the cantle. You can then work on it with silver paste.
You could also seek the advice of a local jeweler. A working craftsman not a retailer of jewelery.
The 'Eathen in his idleness bows down to wood and stone,
'E don't obey no orders unless they is his own,
He keeps his side arms awful,
And he leaves them all about,
Until up comes the Regiment and kicks the 'Eathen out.
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