I'd look for some old five arm 94 BCD MTB cranks. If they're 94/58 BCD, just ignore the 58 bolt circle and fit the 46/30 on the 94 bolt circle. I've picked up a couple of these cranksets cheap off fleabay. For instance, here's a right hand 94 BCD 175mm Shimano crank for $11: https://www.ebay.com.au/itm/Shimano-STX-FC-MC30-Right-Hand-Crank-Arm-175mm-Square-Taper-94mm-BCD-Silver/372699049001 - and find an LH square taper crank in the same length.
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