And yet, my keyboard can do almost (no per-program switching) all of the same FROM A WEB PAGE. WebHID should be all that's needed for advanced input devices. If you want some sort of per-program profile switching, sure, release a dedicated app that handles sending a special HID command sequence to trigger a profile switch.
If the webpage was required to be connected back to Logitech to function, yeah, deservedly so. If, like Via, it can run fully offline then all you'd need is to save the page for offline use and that would be acceptable.