Sounds like the stuff you need is on the way, but back to your questions on oil volume.
Rohloff used to recommend 25ml, but SJS often recommended 15ml instead. (At one time, SJS recommended less than 10ml, but I have not seen that repeated for a long time.)
Then more recently Rohloff cut that 25ml recommendation in half to 12.5ml. Now when you buy Rohloff lube oil, you only get half as much as you used to get.
https://www.rohloff.de/en/company/news/news/reduzierte-oelmenge-fuer-oelwechsel-ab-10-2023Note that the cleaning oil volume remains the same.
If you have a bottle of 25ml, I would only put half in, save the other half for future use. If your hub gets noisy later, perhaps add some then?
If I had a disc on my Rohloff and had to lay it down, I would lay it down on the drive side. My Rohloff leaks badly on the non-drive side. I agree with PH on this. My Rohloff is on a rim brake bike, no disc. That said, mine is chain drive, I do not know if this could put your belt in jeopardy.
Last time I flew somewhere with my Rohloff, I did a oil drain and cleaning oil rinse. Then flew with the hub empty. Added my lube oil upon arrival. I did it that way because my hub leaks quite a bit on the non-drive side. But for my trip home, I did nothing, flew with the remaining oil in the hub but since much had leaked out I did not worry about it.
Side note on clickstand: I do not have one, but I made a substitute for one from cutting segments on an old tent pole shorter, and two trekking pole rubber tips. But my version only works on frames where the seat stays are welded on the back of the seat tube, not on the sides of the seatstay. Welding the frame that way creates a pocket that the tent pole can fit into. I use an extra thick hair elastic band for a parking brake, in the photo I have two elastics.