Just got done with this same project. You are correct about not being able to get a torque wrench in there!
Inner bolt and nut need to be tightened with the car on the ground. If you can't do it that way, at least get a jack under the hub and lift the hub up to put a load on the assembly.
Like you, I ended up torquing the inner bolt and nut as tight as I possibly could.
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