I wish RIV had CL - that would be awesome!
CL at any of the other resorts would qualify for the additional CL FP+. The Poly bungalows and CCV cabins also qualify.
There are also some rooms at Swan/Dolphin that qualify and typically price out less than any of the CL rooms at WDW. Swan/Dolphin rooms do not have a CL however. I believe the CL rooms at Gran Destino also have the 90 day FP+ option and those rooms would price out less than a deluxe CL, typically.
I believe you can get extra FP+ with a
DVC presentation? But I'm not 100% on that.
One other way of getting another FP+ is to book the Frozen Ever After dessert party as it includes a ride on FEA after the fireworks.