SRAM Force 22 chainset in an otherwise 10-speed SRAM setup
If you are prepared to move down to the SRAM Apex model, you can still get a 50/34 172.5mm version http://www.chainreactioncycles.com/au/en/sram-apex-white-gxp-compact-10sp-chainset/rp-prod83674

The first question and answer here indicates that an 11 spped chainring will work with a 10 speed chain: http://velonews.competitor.com/2015/03/bikes-and-tech/technical-faq/technical-faq-10-11-speed-drivetrain-component-compatibility_362722