For your long-term financial well-being, it is probably best if you don't find a demo account for writing puts. You may find it attractive to collect an initial premium telling yourself that you'll except the stock if put to you. But when that happens, it may well be under circumstances that you'll regret. I speak from experience.
Good luck.
Of topic but i was just reading through this thread, and noticed you have plenty of post. Would it seem smart to you if someone used TorS but traded through IB to save on cost?