Just get the Intel Atom Win8 tablet. It has the battery life/Price of RT tablets, but runs Windows x86 natively.

I am no sure how your 5x5 workout being doable in 30-45 minutes means anyone could do the 20 sets of 10 reps in the sample workout in that time.

The workout is about 20 sets of 10 reps. Even at a very fast 1:0:2 cadence, and quite short 2 minute rest between sets that is 50 minutes. That is about as short as possible unless you your just lift ultralight weights for show. Really working it will take longer than that.

30-45 min full body workouts? Then you show sample workouts that would take about twice that. So which is it. You would be lucky to get 10 sets in 30 minutes, the samples have about 20 sets.