I think he already has a PR started and I posted a couple tutorials. It’s not too bad really making something work and I learned something here that I didn’t know about which might make it even better (namely event.type) in some cases.
I started a tutorial over at Migrate from Nashorn to JSScripting for UI Rules. To start I would think Blocky would use the Object.require approach so the differences between Nashorn and JSScripting are minimal. Long therm though I think a number of things that will exist in the Helper Library could make the Blocky implementation easier. I think the biggest gotcha is Thread.sleep breaks and there is as of yet no alternative. That and the String issue are the two big gotchas.
For example, what if the library provided a method to compare two States or compare a State to anything and as long as they are compatible it will give the right answer? That should make your job with the comparison stuff easier I would think.