Hi Alistair, I wasn't aware that Stellarium only used d,m,s. I have been using Skysafari and Starmap Pro which allow you to use either.
I don't understand your numbers but I have made a vernier with minutes for the azimuth, have a good look and advise me as required. You may want to move the vernier to the inside, or whatever.
After that we can sort out how you want the altitude laid out, if you still want it.
Don't concern yourself about asking to much or to difficult. It's not costing me any money and I enjoy the exercise, so long as we get a perfect result.
Cheers
Richard