Well, the 35K ULR isn't an official brand product of Airbus yet, but it is just how Qantas calls their 35K modified versions, but I'd love to see that coming as well.
Interestingly, you can achieve something similar by editing the flight_model.cfg in the community folder before 1.1.0, but after the update, as we know, the fuel quantity was changed to 274808 lbs, but at the same time fixed at 274808 lbs somehow, which mean cannot be overrided by editing the .cfg, therefore, sadly the above method is not achieveable anymore.