Any way to beef up the neutral/power a SmartModule on one leg?

I was considering buying some SmartModule SM2-6 packs but realized to my dismay that they need 3 different legs to operate. Obviously I could only use one leg, but the neutral on them is only sized for about 20 amps max. I'd be limiting myself to only 2 1k's per pack. If I could get them with #6AWG neutral wires, I could make an adapter to power it from a 60A stage pin connector and use it for 6 1k's. Buying a completely new distro system where all the boxes have L21-20 connectors is completely out of the question.

I can't be the only one who wants to power dimmer packs from a 60 amp cable.