So i would do workout A M-W-F and maybe do these aux lifts on monday and friday. Would that be too much?
So wait, when are you doing W/O B or is that on T-T-Sat? (Working 6 days a week?)
2 cents...
That said and just spouting a few comments to think over...
1) More exercises (for the sake of exercises) is not always better, if you have to lower all over intensity or save energy to get thru a workout to hit all the different exercises.
2) If you do add (say a pulling) exercise, add it on a day you are not doing as much other pulling exercises. That way you can hit a group more thru the entire week, instead of just on 1-2 days.
3) As far as "too much", it might be better to stick with a more written plan (especially getting back into it) and then add exercises as you slowly gain more GPP and or work capacity to do so. Many of the standard routines as written, are written because they are good solid programs for the masses, and adding work/exercises just for the sake of wanting to do more, feeling more is better, is not the best focus for the prime directive. Which to me is,
adding weight to the bar, muscle to the frame, and strength to a few key lifts .
I can be a minimalist, that way, I can then put great effort into a few key big lifts, instead of just good effort in quite a few.