> I really don't like Javascript or web view

You really don't like your best option

> But I would like to be able to program linux GUI apps, where i can have a canvas element, where i can seamlessly draw text, images, vector, 3D graphics (via Vulkan, or if Vulkan is not possible then openGL) etc.

Canvas element? Sounds like HTML. Text, images, vector graphics, openGL? Your browser/webview does that, plus you get webGL.

The sooner you come to grips with the fact, the better. For a solo dev, nothing is going to be easier than using a web-based UI. And unless you have a ton of free time to maintain your project, the motivation to do so, and the skills required to juggle the complexities of aging monolithic dependencies, nothing else is possible.