Woah, hang on a sec....you guys slipped a ex FK mk2c into the NIR set! I completely missed it in all the excitement.
https://irishrailwaymodels.com/collections/mark-2-coaches/products/nir-mk2b-pack-corporate-intercity-1
Now that means we can almost certainly expect RTR versions of IR 4103, 4104, 4105, 4106 and 4107.
4109 was the only standard based on the mk2b so that should also be doable. Very excited for the future, even more than I was!