I guess MrLag (one of the staff helping him organizing the cup, and the one who's testing the map zerator has made to validate them) had already done something like that in the past, and zerator tested it live to sho it to the viewers (just the first maps tho)
It's a pretty cool idea, I just hope you already talked to him about it and made him agree. Else, or he won't take the time to try it, or he'll feel obligated once he sees the work's done, and it's not the spirit.
I had made a few maps for the zrt cup 2, in which viewers could propose maps :
this one was by far my best, but in it I use the esl signs.
Good luck with your project