Creating a window tool that acts similarly is possible. A photo album that allows you to select a VSTi to upload. I actually built one and the code is pretty straightforward to do.
However, the problem is not building the tool, but collecting hundreds of images with the same format (image size) so that they can appear in the window. Basically the tool would read the installed VSTi, map an image and display it in a grid with upload options. It could show its name, if it is 32 or 64bit …
As I say, the bulk of the task would not be the code, but the creation of the collection of images (well done screenshots of each VSTi to be visually identified).
That is, it is necessary to have a photo album of all the most used VSTi. How do you do that? For example, 350x350 pixel 24 bit PNG images.
An important thing. For it to work, you need to know the exact name of the VSTi that Renoise uses for each plugin. The linked image must have the same name. If it does not exist, its corresponding image will not appear.
There are thousands of VSTi!!!
FL Studio displays an image panel because it controls the number of VSTi included. It is doable.