The rng manip requires you to set your date to 1/1/2096 but the dates on the 3ds only go up to 2050. Is there a way to get around this?

Yeah, the year only impacts the last bit of seed generation, which is frames since reset + last 2 digits of year. As such, if you were to set your year to say 2036 instead, and just waited 1 second longer for all of the manips, it would work.