Does Glamorous Toolkit work for you? It's pharo with a different rust based GUI stack, and some batteries included for making custom inspector views and such. I don't have a high DPI display so I'm not completely confident, but my understanding is that their rust based GUI works fine with high DPI.

I see some movement on high-DPI in the latest release. What are the current gaps? I'm not familiar with the project, just curious.

> Improves high-DPI support for buttons, scroll panes, sliders, menus, multi-selection lists, trees, drop-shadows, the scratch pad, the keyboard exerciser, and others.

https://squeak.org/release_notes/6.1/#:~:text=and%20dialog%2...