Thanks for your interest and your feedback.
As you already mentioned, the Evaluation Edition of Embedded Wizard is able to create code for Win32 - so you can build your own Windows executable.
Furthermore, we provide a couple of so called Build Environments and Evaluation Platform Packages, so that you can evaluate and test your own GUIs on different popular targets. In this case, we provide libraries in order to protect our IP.
The so called 'Generic Platform Package' is a Platform Package that is prepared for one color format and contains all drawing operations with well-optimized software functions. Thus, it can be easily integrated into your target system by just implementing a few interface functions to the graphics subsystem and to the C library or the operating system running in your target. Since this package has to be delivered in source code (in order to use it on your target, with your compiler and linker) we can not offer an evaluation version of that.
For iOS and Android we have specific Platform Packages using Open GL ES 2.0 as graphics API - so far we do not have evaluation packages. Same situation is for WebGL/Javascript.
Maybe, in your case, the Raspberry Pi would be a good environment for evaluation.