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This is quite in line with what I've read on every other forum page I've been looking this up on - and that tool looks like way more leverage than the 1ft my headset cone spanners would get me. Seems like I should just leave the BB be and trust I haven't over-torqued it.. Also used one of them multitools/decathlon hex keys which isn't much over 20cm long on the cranks so I'm assuming I can't have overtightened the bolt with those.
You shouldn't need to stand on owt to reach 40Nm unless you're tightening it with a multitool or matchstick. As said, with a regular sized tool it's about as hard as you can without really fucking going for it.