Yes, it is OK to do this. You can only get about 500 mL out of the fill hole though and you reset the level by the fill- 40 mL.
Note, having just done mine, the spec on the filler plug is 35 Nm, but mine stripped before that. I felt it start to go, stopped, and left it. If it leaks, it's box out so hoping for the best. It'll be box out next time I change, but that's a problem for a few years time (hopefully!).
Yes, I checked the torque wrench calibration afterwards.
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