I finally got Sony's RM-887 to work from Keyset 1. There were two problems preventing this - the Sony TV Keyset 1 wasn't shown in the TV filter (only from 1a and up) and I missed it from the main screen. And secondly - the range is really... small - 20-30 cm (<~1ft).
As the old saying goes, "that's not a bug, that's a feature!" Well, ok, yeah, that's kind of a bug, but not in the coding sense, more in the design sense. I put the "filter by device" feature in to try and utilize the compatible device data I've been slowly feeding in to Pierogi. But, if you check out the Device Compatibility List, you'll notice that "TV Keyset 1b" is the only Panasonic TV keyset with any devices listed. It's going to take some time to build up a real database of what devices work with what keysets. I probably shouldn't even have that filter in there until more device data is available. (I could also just claim that all the Panasonic TV keysets support Panasonic TVs, but I'd prefer not to make that claim until I've received confirmation that the keysets work on at least one TV. The data I'm using to create keysets in Pierogi is not necessarily trustworthy in all cases...)