Are there any good 5 bolt 130 BCD 11 speed chainrings?
11-speed has the same roller width as 9- and 10-speed, so if you're using non-matching rings anyway then using 9/10-speed ones won't create any additional problems. Stronglight would be the usual #tester_approved option, the basic Zicral ones (avoid the Dural, they're a false economy) will be about £45 for a pair. Stronglight CT2 from ACycles will be about £60 including shipping from France.
external width is narrower meaning new RD / cassette?
It's really the other way around - if you get a narrow spaced cassette you have to get the narrow outer width chain to fit. 11-speed chain will run fine on 10-speed cassettes.
11-speed has the same roller width as 9- and 10-speed, so if you're using non-matching rings anyway then using 9/10-speed ones won't create any additional problems. Stronglight would be the usual #tester_approved option, the basic Zicral ones (avoid the Dural, they're a false economy) will be about £45 for a pair. Stronglight CT2 from ACycles will be about £60 including shipping from France.