Three humbuckers or two hums and a single coil middle? Will 3 hums fit on an IB-1? Either way you should be able to do the split with a single mini-toggle.
If it is 2 hums and a single coil middle you just need a DPDT mini-toggle to split the humbuckers. Simply wire the series links to the switch which will short them to ground or hot (the specific config depends on your pickups).
With three humbuckers it's a little trickier. A 4 pole 5-way lever switch with a DPDT mini-toggle would work... but, if I remember correctly, the IB-1 has a pretty thin body which limits what type of lever switch will fit. Next option is a normal 5-way lever switch with a 3PDT or 4PDT mini-toggle. The 3/4PDT mini switches are harder to find, but then you can split the 3 hums with the one switch just like the 2 hum option.
Edit: Actually, with a bit of sneakiness I think you could do the 3 hum option with just a DPDT as well. If you wire one pole of the 5-way with the 'hot' wires of the humbuckers, and then on the other pole connect the series links of the bridge and neck, you can then use the DPDT mini-toggle to both select which pole of the 5-way is active and connect the middle series link when the split is active. This would prevent things shorting when not being split, but would only work if the same coils are being used on each pickup.
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