How to omit certain numbers from [random] output based on zl filter list?

In the patch below, I've figured out how to filter certain numbers out of a randomly generated stream, but when I press the bang at the top of the patch, I want it to return a new number right away. As of now, I have to keep pressing the random button until it returns a number which is not on the filtered list in order to generate a new number. Somehow, I need to tell the [random] object which numbers to skip or find some other work around so I get a new number in the message box to the right every time I hit the bang at the top.