I’ve created a patch that lets Chromium track extra seats (at least the Wayland version). This allows input from VNC/RDP to be used.
0027-Track-Wayland-seats-other-than-primary.patch (4.0 KB)
I’ve also create a pull request in meta-browser: Track additional Wayland seats by Lachlan-Frawley · Pull Request #728 · OSSystems/meta-browser · GitHub
I’m not sure how Toradex internally builds their Chromium containers, but I hope this helps enable VNC/RDP input functionality.