There are a few ways to avoid being in that 29%.

1. Get a device that runs stock android e.g., nexus phones.

2. Get whatever device you want, then root and flash it with an actively maintained rom. This will be more difficult with some devices than others.

3. Don't get an android device. That leaves Windows phone (why torture yourself?), iPhone (what is customization?), and Blackberry (is Blackberry still relevant?).

4. Don't get a smart phone.

5. Relinquish all of your worldly possessions, and meditate under the Bodhi Tree until you reach enlightenment.

I'm currently transitioning from state 2 to state 4. I've turned my Note 3 into a dumb phone in preparation for my return to the world of flip phones and no apps.