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I'm surprised it didn't come with a pair of spade connectors to attach once you've shortened it. That being said, spades aren't great and I took the time to replace them with bullet connectors when I was moving stuff around at one point. You might not be able to entirely avoid them though (I know I wasn't, I had to a make a few 'adapter' sections). Maybe solder some pigtails onto the rear light and use bullet connectors everywhere else you can?
I've got the hub and front light already running on the bike, so I ordered a rear light and B&M cable (both my lights are B&M). I'm a bit annoyed that it's come without connectors on both ends, frankly - do they sell the connectors separately?