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CPC do some tiny Multicomp toggle switches. I doubt you'll find any smaller than these.SPST on-on SW02454SPDT on-off-on SW02458DPST on-on SW02449DPDT on-off-on SW02452DPDT on-on-on SW04070
I've ordered a relay bypass from 1776 to see what they're like too.
I've heard of NOS but this is just ridiculous.
If it's a USA model, it will be revolutionary.
I just stocked up on Alpha 3PDT stomp switches from eBay, so I've got another 20 pedals to build before I can try the opto couplers.