I relied on the recently-added support for the XR500 in DD-WRT to build an XR500 image of OpenWrt 18.06.2 and flash it on my XR500. All I know is that it didn't brick, was able to do a sysupgrade, and has been working without issues for most of the day, wireless included. I urge caution because I know just barely enough to have gotten this far, and don't know what I might have messed up. I'd advise against flashing this on your gear as a disclaimer, though I totally would have gone for it if I'd seen it earlier 
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