I have just added azimuth setting circle to my DOB.
I got it from richard
here on IIS Equipment DIY forum.
Together with digital inclinometer ($25 from Bunnings a few years back).
And SkEYE android app.
Then all you have to do is align the base to North and level it and Bob's ya Uncle... well in prinicple anyway.
But I would be keen to find an Android app that converts RA Dec into Alt Az real time none the less. If they can do it for a scientific calculator, I would think an Android App was possible.