Hey, looks like you have had plenty of advice, I have read most of the thread, but I may have missed this but I had to ask:
Is there no way you can fit in a workout either Fri, Sat or Sun? I would make that the priority if possible, rather than confusing yourself with the myriad of split training programs.
For what its worth, I have had experience with chopping and changing programs with slow results, and then getting much faster results doing SS properly. Fatser results is alot more enjoyable! So I would recommend sticking with SS and milking it for all its worth. Rippetoe, recommends 2-3 workouts for a beginner, so 2x a week can still be SS.
If you can't train 3 non consecutive days in the gym, I'd suggest:
Thurs: SS Workout A
Sat: Home bodyweight workout: Single leg squats/lunges etc, pullups/chinups, pushups, or other basic barbell excercises, eg rows, presses (if you have barbell)
To save time, do the home workout as a circuit and you are finished before you know it, so you should be able to fit it in.
Mon: SS Workout B
Tue, Wed: Off, and repeat