I haven't done Frozen standby in a while. It's cute? Did something change? IME, the only cute area is almost at the end of the queue, and there is zero to look at before then except for the huge crowd of people during the rest of the queue.
The Remy queue is hardly any better.
However, if I wanted to ride both, I'd get the LLMP for Frozen and ride Remy standby because the standby line for Remy is often shorter than FEA's.
But, OP, you can solve this entire problem by rope-dropping one and using the LLMP for the other.