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On the present bike is a Trek Dialled crank on a 118mm BB. It's actually a nicely designed crank except that the chainring is dished towards the BB. This utterly fucking stupid design decision means that the limiting factor is how close the chainring is to the chainstay. I could only get it to where it is by removing the inner plastic bashring/chainguide.
If the chainring was reversed (which I'm sorely tempted to try with a blowlamp and hammer) there's about 18mm between the end of each crank arm and the chainring, so I could go all the way down to a 103mm BB and reduce the Q factor by 15mm.
I also noticed that islabikes have narrower pedals with narrow spanner flats, which makes sense since they only need to be as wide as a pedal spanner.
To be fair, it's better than when I got the bike. At that point it had 170mm cranks on a 24" wheel bike, which seems daft.
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ffm
What bb and crank setup is on the current bike, or are you shopping around for one now?
Pictures might help. I'm guessing shorter bb axle isn't an option?
I might have a some child specific cranks knocking about if that's a workable solution, I can have a look next week when I'm at the garage