Hi Alex, I've been using Rhino for 14+ years and was curios to know if your problem can't be solved in Rhino rather than Houdini? The reason is two fold, firstly I find dealing with issues closer to the source file is often best and secondly I'm not familiar with Houdini. Having said that, I'd also love to be part of your future projects on the Rhino side of things...?
Let me know your thoughts, perhaps if I could see the Rhino files I'd be able to help with your issues in Rhino.
I hope to hear back from you
Marcus