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You don't need to invest in a big expensive torque wrench. I've never used a torque wrench on square taper cranks, to be fair. I don't own one. I just tighten as hard as I can by hand, with a tool around ~30 cm long, and then I know I'm in the ball park.
Back in a pro workshop I remember using a big torque wrench roughly 30 cm long and struggling to get anything much above 50 Nm (I am of slight build). You don't need to be accurate on alu square taper cranks.
I’ll invest in a torque wrench that goes that high, my current one stops at 15nm I think. Cheers again!