Magsafe to USB-C converter for charging Macbook Pro 2016
Many marketers will ship and are shipping MagSafe to USB-C Adapter on the market:

http://forums.macrumors.com/threads/how-about-a-magsafe-to-usb-c-converter.1877907/

I bought two Magsafe to USB-C Adapter on Aliexpress but neither works. 

The powering light on Magsafe-Connector is on and in the apple menu the battery loading symbol is active for a few seconds but the battery is actually not loading. The merchant gave me a refund after i showed him a video of the attempt.

Be sure you understand the return policy if you aren't willing to eat the cost for testing aftermarket chargers.