If piano is truly your career, I wouldn't risk doing ANY of these exercises just to be Primal.
I like the suggestion to walk a lot. Or just focus on lower body for now.
For finger strength, get a couple Gripmastersfrom Amazon.
For slow and easy gym workouts, I suggest an exercise ball/balance ball. For 25 bucks you can get a ball from Reebok which includes a reasonably good CD (Tanja Djevela-something). Look up "Ridgeline fitness" for some great video podcasts of balance ball exercises.
5'0" female, 45 years old. Started Primal October 31, 2011, at a skinny fat 111.5 lbs. Low weight: 99.5 lb on a fast. Gained back to 115(!) on SAD chocolate, potato chips, and stress. Currently 111.
The thing is, when I was doing kettlebells on a regular basis, I found that it actually helped my piano playing. You need strong hands to play the piano. So I do want to ease back into weight training. But for now, yes, walking is definitely a wonderful thing, and I've been doing bodyweight squats as well. I'll get back in shape eventually.
The best grip training I have found is hanging from a bar. I do pull ups, hanging leg lifts, and sometimes I hang from the bar as long as I can. Otherwise I do BW exercises from the convict conditioning program.
I just got back into the swing of things tonight with a sandbag workout but that would probably be a little much for you at this point.
Check out my primal blog: http://primalroar.posterous.com/