Here's another way to torque fasteners that are impossible to access with a plain torque wrench:

I've got lots of impromptu torque adapters I use while working on my bikes. For instance, here are two that I've rigged up to torque the two 6mm nuts that are on the starboard side of the bottom of the cylinder assy.

This one uses a standard 10mm combination wrench. The open end of the wrench fits perfectly on the drive square of my 3/8" torque wrench:

This one uses a 10mm crow's foot popped onto the drive square of my 3/8" drive torque wrench:

Just get an accurate measurment of the new perpendicular moment arm and do the math. The offset angle of the 10mm wrench is small enough such that it can be neglected, by my calculations.

I keep the conversion factors in a book in my garage. I currently have nine different torque adapters listed in that book.