Postage cost issue to one side, there is a place that will make these - or indeed any similar part - for you as a custom order.
http://www.cedros.org/start_englisch...set_start.html
They need precise measurements, or a piece to copy - and there would doubtless be a minimum quantity, but if it is pearl, bone, wood or plastic they have the capability to manufacture it. Almost certainly not worth it for a single set, but worth knowing about anyway.
My final thought. What's wrong with pearloid buttons?
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