Try a layout with the door shifted 100mm or so to right so that wou could fit bath or toilet on left side. Or move further to get shower on left with vanity over stair. Then cut out your elements and see how the work. Vanity can easily be suspended over stair.

In hindsight, it would have been better to recess the cabinet into the wall. Then you could have some side lighting that wills stick out past the cabinet and give you lighting so the missus can do her thing and you can shave and see everything. I agree with previous comments about pendant lighting. Possibly look at a pair of lights over the top of the cabinet pointing down coming out of the wall. I attached some pics with ideas. Otherwise a row of led downlights above the cabinet would also look nice.

thanks to everyone for your helpful comments! I was going to have to pay around $190 for 6 more, but will order them from Beaumont who have a 25% sale on at the moment. I agree that I need to just live with the cost and finish the job properly, but your shortcut suggestions were all really interesting and much appreciated. And archimondo, I'd say it's like having a kangaroo loose in the top paddock.

Don't wish to upset anyone but the last two years of my father's life it was discovered besides and really bad aortic heart valve problem he also has asbestosis and his breathing was shocking, even on oxygen near the end he still struggled so badly it was horrible for him and just as bad for me to witness it so PLEASE everyone I agree 100% no room for error as the symptom don't show for years after exposure, whatever you decide make it on the SAFE side and don't mess about with your health, my dad was a strong sporty man his whole life and to see him end up like this was heartbreaking, if you can't afford it now find a safe paint and save money until it can be removed ASAP, I think right now get a few quotes too see what you are up for then decided what way forward after removal, good luck and take care