I have now published the Sciter bindings for PureBasic on github
https://github.com/tored/pb-sciter
I have an example in the README that works both on Windows and Linux. Unfortunately I don't have access to a Mac so that is unsupported, however if it works similarly as Linux then it shouldn't be a problem for someone with Mac development knowledge to add that.
There is of course lots of things that needs to be explored still, like how to work with event handlers, DOM and loading of resources, but now there is something to continue on at least.
I need to learn myself more how to do Sciter GUI development and I probably expand the bindings bit by bit.
If the original Sciter binding authors on this forum wants credit in the license that can be added.
Feel free to critique the design of the project.