I am aware that this has been discussed before, but I would like to bring this to your attention again, since it has been years now since Redux has been released:
Currently, Redux is still not really usable in Ardour and Reaper under Linux, since it does not receive keyboard focus. I know you last time said this is a problem with the host (Reaper back then), but it seems that the situation is not that simple: https://discourse.ardour.org/t/renoise-redux-not-receiving-key-events/88301. If I understand the Ardour developer correctly, then there does not seem to be a standard way for Linux plugins to handle keyboard focus (for some reason). Would it be possible to get into contact with Paul (Ardour) and Justin (Repaer) to discuss a way (standard or not) to handle this at least in their hosts? Once this is in place, other hosts might follow that implementation then, and you could even propose your way as a “standard” for Linux VST. I am sure that selling a product that does not work properly is also not in your interest, and I really hope that a solution for this can be found soon.