Is it confirmed that the R730 only uses around 31W (or 34W as quoted in one of the data sheets)?
There tends to be multiple places that quote power numbers for APs (data sheet, release notes for SmartZone / ZD, I believe Unleashed has an appendix with a different looking chart with blue background).
At any rate, the reason I ask is that a popular low cost PoE switch vendor's "802.3at" switches actually are rated for 35W per port, which sounds like it would be enough to use at+ with. I've casually tried it out and not seen any overcurrent faults or anything like that even under heavy load.