No bridge available with the specs you want? Time to make one!
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That's as far as I got before work this morning. It's going to be a stud mount wraparound style bridge for a solid body steel stringed ukulele. There aren't any bridges available for solid body steel stringed ukes except the cheapo bent plate bridges meant for 4 string cigar box guitars, and those have string spacing that's way narrower than a traditional uke. Plus they're really, really chintzy looking.
If this goes well I might try a stud mount bridge for a bass, although I'd imagine a bass will need a separate tailpiece since you can't really do the whole wraparound thing with strings that thick.
I know there are at least a couple other people making their own bridges, anyone else got anything in progress?